Rodgers didn't go to camp. Watson missed it with an injury. Watson still was in and out of the lineup for most of the first half of the season.... But...
Over the 2nd half of the season, week 10-18 Watson was WR9 overall, WR8 in PPG.
In regards to potential, he showed a hypothetical ceiling with a 4 week stretch where he had games of 32, 21, 21, 24. A 3TD game, multiple 100+ games, huge play potential, game breaking speed.
Rodgers only threw 3700/26 last year, which is very obtainable for most mediocre QBs.
You think the TDs are a fluke, okay fair, although when your skill set is speed over the top, those are what tend to lead to huge posts that end up in the endzone (Mike Wallace did it for years) but he had 7 in that 9 game stretch. Let's erase 4 of them... He's still a top 24 WR through those 8 weeks, as a rookie, off an injury, with no camp, a QB who basically tried to doghouse him... And you can draft him as WR 29.
This is a guy you draft to be your WR3 or flex player, who will single handedly win you a few weeks. That's the exact type of way I like to construct my rosters, but it's obviously not the only way.