The thinking is that the longer fish could gain the missing weight vs the shorter fish is growing slower and won't be able to max out on weight in the long term?

Here's the problem with that.. If at 90%, this fish has LOST growth potential. It will never achieve the true potential of the other, shorter fish assuming it stays at or above 100% RW, even being the same age.
Maybe that's where you were headed with this but they need to stay above 100% to really have trophy potential, or even a normal growth rate.