Sure there were other factors as well - but just a few other stats from last year to get you thinking....
In the 5 games without Gordon, Brady only topped 250 passing yards once. In the 11 games with Gordon, he did it EVERY game.
In the 5 games without Gordon, Brady's yards per attempt was under 6.5. In the 11 games with Gordon, his yards per attempt was over 8.
Not saying it was all Gordon - as you pointed out there were other factors, but lets not discount it totally. It was a different offense when Gordon was on the field.
Certainly having someone else to throw to helped Brady, but I think there really is no good way to look at the numbers and conclude much of anything. As already indicated, no Edelman was a huge issue. Brady hurt was a huge issue. Then after finally having some games with JG, then they had to rearrange things to make do without him . . . which certainly didn't help any.
But Brady threw for 343 yards, 348 yards, and 262 yards with his knee in better shape in the playoffs and without Gordon. Did having Gordon help the offense once he came along? More than likely. But did Gordon put up big numbers when he played? Not really.He averaged 65 yards and basically a TD every 4th game. Not horrible but not great. Basically trending toward a 1000/4 season. Again, depending upon where and how a fantasy owner got him, that could be decent to nominal value. Bottom line, he wasn't a huge fantasy impact last year. Granted, things could change, but clearly he would need to be reinstated sooner rather than later and be available for the season.
Unlike past seasons, Brady threw for either 0 or 1 TD in 11 of 19 games last year. That is probably an outgrowth of Gronk being limited and Brady audibling to running plays at the goal line. That was the biggest difference in Brady last year. Between the regular season and post season, he averaged 279 passing yards per game, which over a 16 game season would be a shade under 4500 yards over a full season.
I don't really know what to expect for red zone receiving threats this year. My guess is they continue to pound the ball into the red zone or they exploit mismatches to get White open at the goal line.
Over the past 3 seasons that Edelman has played, counting his regular season and playoff numbers, he has produced at a rate of 106-1255-6 over a 16-game season. That probably won't change much in terms of his production (the verdict is out if he can play every game though).
Given that we have no idea how many games Gordon would be available for (and when he could even practice), it's tough to decipher how he would fit in. I would guess the TE position will be an afterthought in the receiving game this year and the WR group will just get more production overall (and maybe they throw to the backs a little more as well).
If Gordon can be acquired for pennies on the dollar, he's still worth the lottery ticket, but I wouldn't run to draft him until the later rounds. Even if he gets reinstated, I would still be cautious not to take him too early. Drafting him as a depth guy on a fantasy team great. Drafting him as a fantasy starter in the top third of a draft? Likely looking for trouble.