If I’m trading Watson, it’s not to get Tua or Darnold. It’s to get the 2 or 3 pick and draft a QB. Not many other players make sense with that pick and it’s the only way you can sell moving on from Watson to your fanbase. Not with some QB from another organization they were perfectly content getting rid of.
Would you rather have your choice at 2 or the leftovers at 3?
I mean, it all depends what the Texans think of Tua and Darnold. Most likely, they would want to start over with their new guy. But maybe they really like Tua or Darnold. If they really like Tua, then our leverage drops a ton because Tua has more value than Darnold, especially if the Texans are willing to roll with Tua. Most likely, you're right, they would rather get their own guy.
It also matters how much they view the difference between Fields/Wilson. If they think it's close, the difference of picks is important but not a dealbreaker. If they love one and hate the other at 2, then it's a huge deal.