large, it means very little since Bronco really comes up with a complete 2-deep that he trusts and will swap out packages or individuals based on how the game is going or play calls on defense... he runs his defense like an OC runs and offense adjusting his skill positions based on what he wants to do.
So, will Nelson start? No... will be play? yep
Will Blackmon start? probably not, but he's going to get in, and he's going to mess up the rythmn of the defense with someone who can run routes a little faster or just different from the other guy..
Same for Leslie (who I think will be the slot receiver when they go 3 wide)... he's just too good with his hands not to look for on the slant.