Found these three articles interesting.
To summarize the TY article proves he was actually one of the most utilized recievers in the NFL(even when Reggie was healthy)
This article shows that the colts actually passed 60% of the time, which was good for 11th most in the league. The obvious rebuttal would be that this was due to the colts consistently being down, but when adjusted for league average for quarter and score the colts actually passed for 5% more than they were expected to (good for 8th in the league). The problem, according to the author, was the length of the passes and depth of Lucks drop backs.
It's harder to summarize this article because there are many different components of Havili's lead blocking to prove that he was more effective than we thought.