Playing what-if can be fun, but I don't project too much what players would do if they were on other teams. I just look at the bottom line, and Gronk was a winner, big-time..
As far as TE's winning playoff games, I really don't feel like researching it but you can go back to the 2 most recent Pats SB wins and I don't know if they win either without Gronk. Well, the Rams did suck, but definitely the Falcons game.
Yes, he is the greatest TE of all time, but nevertheless, I still say ***** Gronk.