It's not injury insurance that would otherwise never play. It's a good player at a position with less depth than wing.
Anyone who is as good as Crowder currently is would be getting 25-30 minutes a game next year no matter what. That hypothetical player would instantly be the 2nd best ball handler or 2nd best big on the team (better than smart/rozier/zizic/baynes etc.)
Not if it's a point guard. That guy would for sure play less than Crowder.
I also think the wing depth thing is false. I think a 9 man rotation will have two point guards and five wings(maybe 4 and a half wings).
Removing Crowder to add to the ball handlers will leave you a little short at wing, and way over at ball-handler in my opinion.
Even removing Crowder for a big I think is worse because it forces Morris to play more at wing than big.
I look at their nine man rotation now as
Bigs Horford Baynes(unless Zizic can beat him out at some point)
Big/Wing Morris
Wings Hayward Crowder Tatum Brown
Points IT Smart
Depth Bigs Zizic Theis
Depth Wings Ojeyele Nader Yabusele
Depth Point Rozier Larkin
I would much rather have Crowder in my rotation, and have Rozier as my emergency backup if IT can't play, than have a better insurance policy on IT but have to cover for Crowders 30 minutes with the other wings.
If you can trade Crowder for a big that's much better than Baynes, OK I guess. But I don't think that solves a problem. It's just shuffling deck chairs and you've just decided to play a little bigger than currently setup. Not necessarily better or worse, just bigger.