As of today I would agree with you, but I'm not sure there are actually 15 teams in the QB market this year, and that number will go down significantly after the draft.
Washington, Tampa, Pittsburgh, New England, Atlanta, Minnesota, LA, Denver, Chicago...Is anyone else really looking at QBs this year? Maybe a team like the Giants could be inplay but would they have the resources to move on from Daniel Jones already and sign another big name QB? 9 teams by my count and you have at least 3 guys in the draft likely to be a day 1 starter. Cousins, Mayfield, Wilson, Fields all in play for these teams as well. By June you may only have a couple teams with their QB spot still up in the air and it comes down to do they have the cap space to make it work that late in the offseason. It might actually be easier for Dak to negotiate with these teams as a trade candidate than waiting than hitting free agency in June.