Ok, 1st of all, 100 top picks doesn't work as argument for using rounds, since it includes the beginning of the 4th round.
2nd of all, your grouping rounds together. How many NHLers taken in the 1st 3 rounds were taken in the 1st round vs. others? Whats the relative value of each individual draft position.
Of course NHL GMs are more willing to part with later round picks. They're also more willing to part with late 3rd rounders than early 3rd rounders, early 3rd rounders than late 2nd rounders, etc.
That isn't an argument in favour of using 100 picks. You did research, you can share your sources.
