Lander has had knee issues all year I believe, otherwise probably would have seen more time, especially with Phin's injuries. As such he might not be as disappointed about lack of minutes as some seem to think.
Tamar's lack of playing time was really about defense and if he views it the same way, he likewise might not be disappointed about lack of minutes, especially if he thinks he can improve in that area.
I think TJD and Race are a package deal, either both leave or both stay.
I think Stewart is done playing. I think he transferred to finish up a degree and get one more complete year on the court after the death of his father.
Kopp/Durr might be in a situation where they either stay or are done with basketball. After already transferring once, I believe they'd need to sit out a year. Plus, if they did that, they would count against a team's scholarship limit next year which would substantially reduce any interest they would get if they want to transfer.