The scenario was, in your words: Free bounces back, Frederick is an instant quality starter, and Leary can take over one of the OG spots and play solidly.
NOT Free bounces back, Leary is a minor upgrade, Frederick is solid...but "Free bounces back, Frederick is an instant quality starter, and Leary can take over one of the OG spots and play solidly."
To summarize: Free bounces back (I took that to mean bounces back to 2010 form, not 2011 when he still wasn't very good), Frederick is a quality starter (not merely solid), and Leary is solid (not merely a minor upgrade).
I wouldn't (and didn't) say that would make the o-line a "strength" but it would certainly be better than survivable.
I was kidding about the Garrett thing but in retrospect maybe there is some truth to it.