I thought about this in the middle of the night. So many "what ifs"...
But in the end, I think he just got tired of runnin' the rock & carrying teams on his back & to suffer a lot of pain for it. When life & success came calling, I think he just wanted to move on. Soon his IG & other posts had very little about football in it, unlike other Ram members. Ya they're living their lives too, but look at AD's posts... Kupp's.... even Goff's to an extent. These guys were/are still grindin', but I think Todd's knee(s)** were so painful that the grind just became impossible. I think he toughed it out for his hometown ATL, but even there you could tell -- he just couldn't do what he used to, he was a one trick / one cut pony.
Oh, but the years we had... so awesome to watch him. I really think he was what made the Rams so successful in their run -- ya we had a lot of major contributors on those teams, but without the TGIII magic, we didn't have that pop to put us over the top. So thankful to have called him a Ram. But sad to think what could've been. He really coulda been an HOFer, he was that good.
**(who really knows how bad it was? woulda been nice for him to let us know, maybe we'd care?)