I disagree. I think Gus sees Harley as the other natural attacking play-maker with Vicente. A fully fit Vicente will be first choice but that still leaves room for Harley plus two wingers on the bench now we're back to seven subs.
If vicente starts, one from dicker/crofts/bridcutt drops to the bench. Along with a keeper. Two wingers. Defensive options and striker option
Ankergren
Dunk
Calderon
Dicker/crofts/bridcutt
Lualua
Buckley
Agdestein (or other striking option)
No room for Harley. If he's not good enough to displace dicker/crofts/bridcutt from the starting line up, Gus isn't going to make room for him on the bench at the expense of the players who he isn't better than.