I'm not a huge fan of a 36 year old OG as our rescue plan.
I thought between Rupcich, Brown, Butler - we have enough to spot start in case of injury.
I know reports are that Brown has struggled at Guard, but he's the only real backup at Center - which is much more critical, since others can help at Guard if it's a mid-game fill in situation.
I mean, Van Roten should still be available on the couch if we're in say, week 5 or 6 and really need a backup. By then we could also know if any of our guys are really not going to cut it.