Just my two cents, as I want no part of jumping in on this discussion that got lengthy in a hurry.
Imo, Sanheim is better than Morin and Hagg already at this point, however, the latter two are hitting their sink or swim stage while also having little left to prove at the AHL level relative to their projectable future roles---Sanheim, on the other hand has more time on his side and also has more left to prove at the AHL given that his future projectable role in the NHL is much more comprehensive and important to us.
I've got no issue whatsoever with Hagg and Morin starting with the Fyers out of camp, provided that they're up for it, while leaving Sanheim in the minors to soak up #1 defensive minutes and especially the PP1 minutes.
Sanheim, to me, has always seemed to take a little bit of time to fit into new teams and new levels, I believe because the game he's capable of is so overbearing and dominant. For example, we all remember how unstoppable he was in juniors, he ran an entire team on his own, it was ridiculous to watch. When thrown into the WJC, he seemed to hold back his style and game in an attempt to fit with the coaches expectations in a short tournament. He's shy but respectful and confident, I've got not problem with that and would like to see him given the opportunity to show his true colors and build up all that momentum at the AHL level, letting him blow the doors off the place and take that confidence upto the NHL from there. I really don't think it'll take him very long at all once given the similar green light that a guy like Brennan had last year, and think it'd be worth the while to let him experience.
When he gets up there, I'd really like to see him in Ghost's spot on the PP1, Ghost in Jake's spot, and either Lindblom or Jake in Schenn's old spot. With Ghost in the real prime shooting area, I don't think it's so essential to have a great shot in the middle and even though Schenn had a decent shot there, most his his tallies were from willingness to get into the dirt and bang home rebounds and other point blank opportunities.