So what happens if he comes back, he grades out better overall but the line performs lousy as a unit? The supposition here was that WHAT IF, during his absence the line continues to perform at a very high level. Do you risk upsetting the chemistry between players? <---- Again, this has nothing to do with individual talent.
A line of non all pros working together is a better line than five PBers working separately.
IMO if this line is playing well together and controlling the line, then do not disrupt it by placing Pouncey back in there.
Now the question is. What happens if the line is getting it done & they place Pouncey back in there & the OL play diminishes?
Conversely, what if it gets better.