Haha don't be difficult! So if aguero is second choice now behind bony aguero hasn't been dropped.no, he can't be dropped as he hasn't been picked yet.
If Willy is picked over him then he is first choice under Pep until he is dropped.
Hart has been number 1 for several years - if he hasn't been "dropped" per your definition, he has certainly lost his long standing number 1 spot which would quite a big thing.