Taysom has been very good at every position he has been slotted into. Those that argue he could never be a starter at any of them are nuts. Only 22 WR/TE in the NFL had more receiving TD s and only 15 had more total TDs. Those are stater numbers.
I don't think anybody could argue that Taysom isn't at least a viable TE2, RB3, WR3, or QB3. IMO, the only thing that's debatable is whether or not he could be or become a QB1. But that's not specific to Taysom. It's debatable for every QB drafted and every back-up on every team that has never had to start multiple games.