If you want to see a pretty good indication of how Dorsett should be used and probably will be used in the NFL, check out how Denver and Peyton Manning use Brandon Stokely. Dorsett was thrust into the "#1" WR role and placed on the outside, but he should be doing his most serious damage inside and forcing defenses (LBs and Safeties) to respect him over the top, which would clear out underneath routes for guys like Walford, Scott and our RBs.
With Duke forcing defenses (LBs specifically) to lean forward next year, Fisch will have an opportunity to utilize Dorsett as a "pick your poison" alternative. If you'll notice the bomb he dropped on that first play against ND, he was out of the slot, I believe.