Diggs
Davis
Harty
On paper, those 3 are the only locks because it would really mess up the teams' bankroll if they were to be cut.
Sherfield seems like a guy they brought in to back up Diggs, and from what I've read he has been impressive.
After that, you have two 5th rounders (Shorter and Shakir) and a multitude of other dudes who have all impressed. (Patmon, Shavers, Ateman)
Can't see them keeping the older 5th rounder over the newer one, kinda defeats the purpose of why they drafted Shorter in the first place.
And I doubt they have plans to keep more than 2 dedicated slot/gadget WR's.
My best guess...
Diggs
Davis
Harty
Sherfield
Shorter
Shavers
From what I've read Shorter is a special teams ace at gunner , and so is Shavers (he was actually Araiza's gunner on ST for the aztecs).
Also, don't forget Kincaid needs touches too so imo there is no real reason to put such a heavy emphasis on slot depth, especially when they have Diggs and Sherfield + Harty if they wanna mix things up.