Just my two cents here, but...
I don't see how you sit Gibson for Salas. While it's true that Salas will fill into Amendola's checkdown/slot receiver role, the guy is a rookie with one career catch. Not only do I think it'll be a shaky transition, but I doubt Bradford is going to be looking the way of a guy he has very little NFL chemistry with too often.
Gibson and Bradford at least have some chemistry together, and I expect Bradford to be looking Gisbon's way alot tomorrow night. Gibson led the Rams in receiving week one (hey, 3 receptions for 50 against Philly doesn't look so bad after what Roddy White and Julio Jones did tonight), and is literally the only player Bradford completed a pass to last season, save for TE Billy Bajema. Everyone else is either new (MSW, Kendricks, Salas, Cadillac) or injured (Amendola, Clayton, SJax).
I'm starting Gibson this week, and didn't even bother picking up Salas out of free agency. But that's just me.