A couple of things jump out at me.
IIRC by week 17 half of our starters were either rookies (and half un-drafted ones), practice squad signings, and wavier wire claims. A lot of them hadn't been here long. Yet we managed to beat the Pats at home and seal their playoff fate. To me that says something about the coaching staff's ability to mold a bunch of new and/or inexperienced players into a cohesive team in very short order.
A lot of talk is about how raw our OL draft picks are at pass protecting. Most agree they are solid at run blocking. If we run a heavy % of RPO concept plays would that change how you feel about the OL's early success?