It looks like Ryan Kelly, who has another year before free agency, is putting it out there that he loves Indy and he'd like to be extended this offseason:
https://www.indystar.com/story/sport...be/2733117001/
While this might a slightly lower immediate priority than re-signing Castonzo , I could definitely see this happening this offseason. Kelly is young (26) and is obviously an integral part of the OL, though he's had some injury issues in the past. Judging by Quinton Nelson's enthusiastic "Ryan! Ryan! Ryan!" exclamations recorded in several mic'd highlight plays, I'm guessing the guy is well-liked among his teammates.
Currently, the highest paid center (on an average yearly basis) in the NFL is the Raiders' Rodney Hudson at 11.25M per:
https://overthecap.com/position/center/
Assuming there are no long term injury issues, re-signing Kelly (which I'd guess would be in the range of $10-$13M per year on a 4-5 year contract) would seem to me to be a good use of some of our cap space at this point, and would serve Ballard's stated goal of rewarding our homegrown players.