I have a different take on the Carlsson being a part-time 1C.
First let me preface that all I cared about is Carlsson playing top-6C, and didn't care where. If Carlsson comes over to NA for rookie tourney and training camp, then he needs to stay on NA ice for consistency with coaches, teammates, narrower ice, and NA style game.
Ducks' GM Verbeek has stated that he prefers "overripen prospects". Verbeek contradicts that modus operandi when he wants to move up his rebuild timeline this year. He can do that by testing out many rookies at the NHL level. Last year, the Ducks had one rookie in McTavish, in his D+2 season. This year, the Ducks have five rookies make the NHL roster to start the season.
C Carlsson, D+1 ... (1C)
LD Mintyukov, D+2 ... (top-4D)
RD Luneau, D+2 ... (not yet ready for NHL)
LD/RD LaCombe, D+5 ... (top-4D)
C Groulx, D+6 ... (3C)
All the rookies except Luneau have looked like NHL mainstays. Big gambles on both 19-year old d-men Mintyukov and Luneau; Mintyukov has improved between rookie tourney to training camp to the NHL. Knowing Mintyukov can thrive at the start of the NHL season instead of waiting halfway through the AHL season is a big relief for GM Verbeek. Similarly can be said of the rest of the rookies.
Oddest thing is that no one's complaining about Luneau having only played two games this season and he's been healthy all the while, unlike Carlsson, who was put on season opening IR (SOIR).
Since Carlsson came to Ducks rookie tourney and training camp, Verbeek gets to see him play in-person on NA ice against his peer age and against NHLers. Report card on Carlsson by the GM and coaching staff from the rookie tourney through training camp was the more talented players Carlsson played with, the better Carlsson played.
Let's circle back to Carlsson being on SOIR. At Development Rookie camp (Dev camp), the org were running several tests, including skating endurance. During training camp, new head coach Cronin was doing full practices in the morning and then playing a full game later on in the day. Near the end of training camp, Carlsson slipped while attacking the net at practice. He slammed against the boards and lost feeling in his hips and legs. It's quite possible that muscle fatigue set in as Carlsson was overworked.
Rather than sending Carlsson down to the AHL, Verbeek would induce load mgmt to improve Carlsson's strength and stamina. The amenities at the NHL level are better than at the AHL level. Plus, Carlsson said he didn't want to go to the AHL, but back to the SHL if he couldn't make the NHL during a summer interview. I'm guessing that Verbeek is utilizing the NCAA method of playing two games close together and then four to five days rest thereafter. This process is scheduled for two months and then re-evaluated after two months.
To ensure Carlsson wouldn't be sent down to the AHL, an agreement was struck to keep Carlsson all season in the NHL and Carlsson was immediately given his new jersey number, 91, to solidify the handshake deal. In the Ducks' recent franchise history, rookies never get their set numbers until they have proven they are established in the NHL. Carlsson and his agent are happy to start his ELC this year, rather than be sent down to the AHL after 9 NHL games so his ELC could slide to next year.
Verbeek made a compromise with Carlsson so that Carlsson develops on NHL ice at SHL/NCAA pace. Carlsson was playing wing for the past two years with Orebro; as others have mentioned, playing 14 minutes a game last year. This season, Carlsson is playing 1C and at a 20 minutes a game. That's a significant shift in time, position, and level of play. He has to play 1C to best optimize his play, based upon the coaching staff and GM, which many advance stats support that optimization.
The usual course of action for D+1 players are play all season in the NHL, play 9 NHL games and get sent back, or play in the AHL if the prospect was not drafted from the CHL. C Zegras, the 9th overall in the 2019 draft, didn't go pro until his D+2 season. Even then, he started off at wing in the AHL, then called up to the NHL to play wing. Afterwards, sent back down to the AHL to play center ad called back up to play center at the NHL level, all in one season. Zegras has 24 NHL games in that D+2 season. C McTavish, the 3rd overall in the 2021 draft, got 9-NHL games in his D+1 season at wing and sent back to juniors. Speaking of the 2021 draft, the Michigan group stayed an extra year in college with #1 OA D Power, #2 OA C Beniers, and #5 OA C Johnson. #4 OA Luke Hughes also stayed two years with Michigan.
GM Verbeek isn't doing this load mgmt for Carlsson, but for his sake. If Verbeek hits on 4 out of 5 rookies this year, even on load mgmt, then that will be considered a success in a development season. The following year, the expectation will be much higher as those four rookies have had an NHL season experience under their belt. Not only that, but also a year for the several prospects that joined the AHL this year to give the Ducks in 2024-25 talented depth in LD/RD Zellweger, LD/RD Hinds, C Gaucher, and RW Pastujov.
Carlsson is playing 1C, albeit on a special schedule. That's all I cared about for his development this year, so I can't complain.
I think this load mgmt is a special case for Carlsson and a GM needing faster results for his rebuild. Faster results as in completing the rebuild a year earlier than projected. Giving up the ELC for a part-time player doesn't sound like great asset mgmt, especially when Carlsson could be a 1C full-time in the SHL (Orebro) and then transition over to the NHL as a full-time 1C in his D+2 season. Then factor in the added complication it does for the head coach rotating 1Cs for the season in his first season coaching in the NHL.