First things first, this isn't a "Hate on Witten" thread, I just found the topic interesting.
Earlier this week, on The Break, they were talking a bit about Bennett and that led to an interesting anecdote about how when Bennett was on the team, Witten had made sure that he got his touches - even at Bennett's expense. They mentioned how Witten (at least at the time) was very much thinking about getting into the HOF someday, so he cared about his numbers.
Anyway, it was an interesting comment because I'd never really thought of Witten as a a numbers guy but it's always been clear to me that you can't be as good as Witten is; as good as Dez is; as good as Romo is - without caring about your numbers.
All this is to say; it reminded me of how Witten pretty much gave Bennett the cold shoulder the entire time he was here. Witten was still as productive as ever, and eventually that led to Bennett being "The blocking TE".
I'm just thinking of all the TE's that have been through here, and I don't remember a single story about how Witten was mentoring any of these guys or taking them under his wing. He's got no interest in training his replacement, which makes a lot of sense - he doesn't want to be expendable or replaceable. He's not the only one, it's well known Peyton hates letting his backups take snaps in practice or in the games.
So, could it be possible that Witten is part of what's kept this whole 2-TE thing from taking off? We all know how respected he is. It's possible he's never the guy in the film room/huddle saying, "Look, Fasano/Bennett/Escobar is wide open on this play, why not go there?".