I don't see how Vrabel's comments can be construed any other way. That's a lot of praise while directly referring to his performance at that specific position last season.
As for Bradbury, they had to take some chances to build quality depth, and they wisely spent a little more to do that. As we know, that offensive line was in tough shape last year, and center in particular, especially after Jake Andrews went down. Didn't leave much margin for error and David Andrews getting hurt was one of the unluckiest things we saw last season. Couldn't really afford to lose him because his backup was already hurt. All things considered, Brown did a serviceable job, but they're essentially starting over. They absolutely needed to make sure they added guys who could contribute.
But yes, if Strange outperforms him (and Jake Andrews), I'm sure he'll get the nod. Performance always trumps money. Unless someone gets hurt or they don't have anyone they believe can step in and play well at guard. But if that's how things look come August, that would definitely be concerning. Guard's a position they've at least had plenty of bodies for, and if Onwenu is healthy, it should only be left guard they're worrying about.