I absolutely second
@Anaheim4ever 's post. Fantilli does utilize his teammates very well for the most part. Of course he still needs some work on that, but let's face it: how many of us have really seen him in a full game during his NCAA season? Multiple games?
We all got to see him pretty much for the first time during the Worlds last month and there he was stapled to Milan f***ing Lucic most of the time.
Lucic is about the slowest player I have ever seen play live and his skating is akin to most beer league players'. Fantilli pretty much is twice as fast as Lucic, and I'm not even exaggerating much here.
If you put a speedy player like MacKinnon with a slob like Byfuglien, you'd also start questioning MacKinnon's decision-making even though he is top notch at that, simply because he has to wait æons for the latter one to arrive at the spot he is supposed to.
We all agree that Fantilli needs some work and has to be less hectic or even frantic in his play some times. But that's clearly coachable, and it has been reported numerous times how adaptable and eager to learn Fantilli is. That being said, we all agreed beforehand that e.g. players like Fowler, Lindholm, Manson etc. had been dragged down because of playing with a plug like Shattenkirk in the past few seasons. If we can easily draw the conclusion of them being hampered due to subpar linemates, why do we not apply that logic to Fantilli as well?
I'm not saying that Carlsson would be a horrible choice per se, far from it. He will be a star player down the road. But I strongly suggest we do not blow up the (legitimate) flaws in Fantilli's game to disproportionate 'concerns'. The only possible 'concern' I might have with Fantilli is his possibly rapid decline past age 32 or so due to his intensive game. But players like Perry can also show you, that this sandpaper game doesn't have to make you fall off a cliff completely, but you need to be able to adjust and be used accordingly - and that is where virtually ever scouting report said that Fantilli can play up and down the lineup and always be successful.
Btw: the comparisons to Byfield are moot. Byfield benefitted from being a man amongst boys fue to his frame and was hyped a lot because of him being black. The marketing machine did wonders there, and it backfired horribly.