I don't think Montoya is a player that can unlock a game by doing something special. He's just a player that does his job overall, nothing out of the ordinary and lots of passes backwards or sideways from him. Alves takes a lot more resposabilities than Montoya and was a big part in Barca's success over the last 5 years precisely because of the risks he take with his passing. Montoya is a pretty one-dimensional player unfortunately.
I'd rather have a player that makes 5 or 6 great plays out of 10 attempts than one that almost never tries anything. When you don't try to make a difference, you don't make many mistakes. That doesn't mean you're great. It just means you're afraid to try something other than a plain, basic back pass.
Being a ghost in a match is not a good thing. Sure, you don't screw up, but you're there to count, not to be invisible.