Also do you think Grixby would have been replaced as a starter by the USC game last year if Bowman was not injured? I don't.
Resoundingly YES! Again, its not that Bowman is the best we've got (injury prone), its that Grixby is the worst we have got. (As far as potential starters anyway)
I still contend Jones was a worse cover corner than Grixby. Especially when you consider that Grixby (not Jones) was matched against the other team's best WR. Let's face it, the entire D sucked against the pass last year.
As to whether Grixby would have been starting by the USC game, remember that Jones replaced Bowman and that Grix was always the starter.