Collier's best month was February. Go back and look at the box scores to see who was playing.
He got more assists in Feb, but was a more efficient scorer in March/April. Over the course of the season Collier was just as good or better without Lauri/Collins. Regardless, I don’t think there’s a significant difference in his actual development. Nobody was calling for Collins, Lauri, or any other vet to play more at the end of the season.