As i already mentioned, Red Wings cannot afford to trade those players in order to keep the rebuild moving on.
Larkin - proven 1st line center. 9 1st line centers scored more points than Larkin this year. Larkin outscored Barkov, Hintz, Aho and Eichel, all the centers from top-4 teams this year. 70-80 point 2-way center at the age of 26, no GM in the league would trade him away.
Kasper - Only potential top-6 center prospect, his ceiling is 70-80 point guy but most likely ends up reliable 50-60 point 2nd line center. With the lack of center prospects, Kasper becomes untouchable.
Raymond - 1st line winger and still more room to improve, still under ELC and after that cheap bridge deal. Extremely cost effective.
Rasmussen - top-6 grinder, exactly what Leafs would need. Ras has finally figured out how to use his size and strenght properly, with some good luck Wings could have the next Tage Thompson in their hands. Red Wings brass and coaching has mentioned often how Red Wings needs to become bigger and tougher to play against, Ras fits in that mold what they want. It would be stupid to trade him, especially when they are going to re-sign him with very cost effective bridge deal. Rasmussen's leadership qualities has been praised and immediately after Ras was injured, Red Wings fell from wagon. Ras can also play as a center, which makes him even more valuable.
Mazur - another potential top-6 grinder. High scoring player in the USHL, NCAA, U20 Worlds, AHL, teams chance, linemates change, level's change but Mazur keeps scoring. Board battle monster, Mazur wins 90% of the board battles. Very good change that Mazur makes his NHL breakthrough while under ELC and after that comes cheap bridge deals, again very cost effective. Now Mazur is untouchable, 4-5 years from things might be different.
Söderblom - Massive, mobile and skilled, real unicorn player. Very rare compination, Söderblom can be anything from a 1st winger to a 4th line winger. Made his debut already, wasn't quite ready but he ain't far. It would be incredible stupid to trade Söderblom until we see what we really got.
Lombardi - excellent rookie camp and excellent OHL season. Lombardi could be something or he could be nothing, very intriguing prospect. Again no point trade yet, potentially could provide tons of secondary scoring. Cheaply.
Seider - 1st D in the NHL at the age 20. Ceiling: Chris Pronger, conservative estimate: Victor Hedman. Not a single GM in the world is going to trade away a #1 defenseman, unless there's similar defenseman coming in.
Edvinsson - Massive, mobile, physical, skilled, future top-3 defenseman in the NHL. Ceiling: Victor Hedman, conservative estimate: Jay Bouwmeester. Under ELC which is followed by cheap bridge deals, very cost effective again.
Wallinder - Big and extremely mobile. Wallinder has all the tools to become top-3 D in the NHL, unlikely to score much but defensively excellent. Slow learner but keeps improving game after game.
Walman - He is very loosely untouchable, i only put him to the list because Yzerman really likes him. Yzerman has said that he considered drafting Walman and then later trading for him already in Tampa. Now he did trade for him, Walman has great chemistry with Seider. At the moment Walman is untoucable but could change soon.
Cossa - Yzerman traded up to get Cossa, what's the point to trade him since assets were spent to get him in the first place?
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Provonov has never been the talent what Seider is. Couple good season's behind prime Giroux. Marner for Seider trade only improves the Leafs, doesn't make any sense for the Wings. 1st winger isn't even the biggest need for the Wings, Yzerman sure as hell wouldn't trade 1D for a winger.