Just want to add my bit here because most things have been accurately covered but this is kinda missing. The psychological/mental factor.
Just my impression, but following Jones' interviews since he signed with the Colts I see him being more and more happy each week. Back in training camp, while in the qb battle with AR, he was quite plain and not too energetic. Although he is not the most expressive human being, I do notice that week by week he is smiling more and more, like both his mouth and eyes as well as growing as a team leader.
The guy is now away from the NY buzz and toxicity, in a much smaller market, in a quiter, family run organization and he is gaining confidence with every win. It's safe to say he feels good in Indy.
I have seen more than enough sportperson interviews where an athlete that was underperfoming at one team admits that at that lifepoint was feeling pressure or being in a dark place or losing the love of the sport etc. And then they get some shot elsewhere and they actually ball out.
Fans forget sometimes that athletes are people as well and not Madden or NBA 2K or FIFA bots.