It looks like half the field made at least a 2 point jump upward from their previous top in their last Derby prep. At 1st I was expecting this would indicate a bounce coming, but when I reviewed the archives it looks like those jumps don't mean a bounce is necessarily coming.
The jumps:
# of horses-jump up
2-2.0
1-2.75
2-3.0
1-3.5
2-4.0
1-5.5
1-6.5