I have Mahomes, Rodgers, Wilson, Brady (until he's incapable of throwing he very much ahead of Dak, no contest), Brees, Stafford (highly underrated), BigBen, Ryan, Cousins, Jackson and Watson ahead of Dak. All of those except Jackson are better pure passers. Jackson is ahead of Dak due to his legs, he can run and be decisive about it and that's a greater threat than just being able to run when a wide lane is there.
The only way I see Dak moving up is when players retire, I can't see him being a better passer than where he's currently at. His reads may develop more, but the ability to put the ball in the right spot consistently is capped.