Another thing about letting bucks get older is so that they can "come into thier own" and sort out a pecking order and breeding order amongst themselves. At 1 1/2 and 2 1/2 these things are haphazard, as there is not age structure. You have to let them go so they can get older. Does that make you feel better. Forget the whole letting them go to make P&Y, let them go to get older(which just by nature will make them bigger)

If you have a great age class structured herd with bucks able to get 4 1/2 and 5 1/2 years old, then taking a couple younger bucks here and there ain't going to do harm, its when there is a TINY% of older class bucks, and 80% of the bucks taken are 1 1/2 years old then you have a problem.