Silva should take this comfortably.
Rousey's as close to a lock as you can get.
Barnett/Browne is a toss-up, where the fight depends on Browne's cardio to be able to move, stuff and strike for 3 rounds. I do think he could handily out-strike Josh, but he's a huge guy who has gassed before, while Josh is durable and game to the end. Josh will probably finish the strongest by scoring takedowns and could get a late sub.