It really comes down to how improved the staff thinks he will be next year with 25 games * 15 mpg worth of experience vs. the potential of a him being a very experienced part of a nasty team four seasons from now. This will very likely be a bubble team next year and maybe the 3/4's of a season's worth of experience and building chemistry puts the team on the right side off the bubble?
One interesting consideration is that redshirting him for the rest of this year essentially eliminates the risk of him transferring the following three seasons since he would lose a year of eligibility by doing so. The 5th year grad-transfer would still be fair game, but that exception doesn't look likely to be around four years from now. Yakwe has expressed his willingness to prep or redshirt this season to work on his game and at 6'7 he's not a threat to go to the NBA early unless he just becomes insanely good and that would be win for both sides.
I don't think there is a wrong move here, and I trust the staff completely.