Crump has shown that he can score from long range. He can knock down pressure free throws. And he can score a bunch of points in a short time (he scored 13 in 16 minutes against Tennessee).
Crump's a great complement to J.J. Sure, you likely have to play zone if both Crump and Frazier are in the game at the same time, but we need to play more zone defense anyway. The pay-off for UGA will be most apparent on offense, because teams can't just double-team J.J. or Yante if Crump is in shooting position.
Unfortunately, Fox hates zone, and he apparently dislikes adjusting his scheme to his talent. I remember being stunned that Fox sat Kenny Gaines instead of finding a way to put him on the floor with KCP.
Likewise, Coach Fox will have his reasons for not playing Crump all year:
"He was behind a pretty good player in J.J.", will likely be his "go-to" reason. If he doesn't reach for that one, he'll say that "the match-ups didn't favor" giving Crump any time on the floor. Fox will then declare that "Crump has been getting better in practice all year."
I say, if you're in next-to-last place in the SEC, do something different! Besides, J.J. won't be here next year, so give Crump playing time now.