That is how I see it:
Diggs - elite WR1
Hopkins - elite WR1
Davis - OK WR2, high end WR3
Harty - Big ? if he can stay healthy. Explosive player. If healthy, quality WR4
Sherfield - WR3 for Miami last season, very good blocker. STer too
Shorter - Strong, work ethic. Camp will tell. STer as well.
Shakir - Best case is Slot #2 behind Kincaid as of now