Joe Montana is considered the GOAT WR. He had Montana (considered the GOAT until Brady) and Steve Young (considered to have one of the best primes of all time) throwing to him during his prime and most productive portion of his career. The person throwing shouldnt matter.
Here’s just a fact, on game per game basis, Gronk dominates Gonzalez. When it comes to blocking, which is a prime function of being a TE, Gronk is a high level blocker, Gonzalez really wasn’t. Gronk is pound for better. Gonzalez has longevity records. He’s probably the best who lasted the longest. As a pure player Gronk is better. Gronk might be the best skill player in the league during his era. Gonzalez wasn’t. He was a generational TE, but he didn’t have an argument for best skill player in the league during his era.
If you took every coach and said for one game you can pick Gronk or Gonzalez they would all pick Gronk. He does more, he’s more dominant, he’s a freak athlete, he makes the QB’s job easier because he has a larger catch radius, he can help on the line, he’s a mismatch for most defenses.
Gonzalez has longevity. That’s it. If you want to play the guessing game and go well this guy threw to this guy.... lots of all time great WR’s had crap.