Before anyone begins throwing tomatoes, let me say that I do not have a firm opinion on this at this time. Trubinsky was never on the Texans radar (and I say this despite his recent 6 TD performance). But we do know that Mahomes was. I'm not a certified QB expert, and so I throw this out as an honest question.
I am not sure what you are asking? Neither Mitchell nor Mahomes were available......you are asking IF all QBs were available did the Texans choose the right one?
Situation matters. Different personnel, different scheme, different coaching etc.
But in a vacuum....
I thought Watson was the best QB prospect in that draft class and I still feel that way.
Imho there was/is a lot that made the best prospect for in my eyes chief of those being....p o i s e. Mahomes has a better arm, Mitch has a more durable (seeming) NFL body.
The aspect of Watson game that I like/liked -confident decision maker which led to him getting the ball out quickly
Playmaker-can escape sacks/pressure and turn a negative play into a big play...and can be used in the read-option game to keep defenses honest.
I was concerned about Mahomes adlibbing too much and not giving the designed play a chance....and I was concerned about how raw Mitchell was....and I wan't hesitant about both of their versions of the spread.
But for me it all comes back to poise...if the other QBs played behind the Texans current OL I don't think they would look nearly as good.
If Watson was in K.C. I can't think of better situation for a young QB then to play in an Andy Reid system.