Some people just don't "get it." Cutler was a nobody, a low draft choice, maybe 2nd round. He had EVERYTHING to prove at the combine and so he worked out and did well. Now he's a top 3 QB. He probably COULD NOT have hurt his stock at the combine because his stock was so low.
Vince Young is a different case entirely. He had a brilliant season capped by an out-of-this-world performance in the Rose Bowl, probably a little more difficult venue than the combine. He ran, he threw, he QB'd the offense, he did everything and if you were grading him on a scale of 100 points for that performance you could not possibly drop below 98-99.
Since then, Vince has not done so well. He made a mistake in representation which just shows that he's a little more unsophisticated than you would like, he's not already a professional player with a professional's view of the game. Then he gets the lousy Wonderlic score, and he's black, so everyone assumes he's not the brightest light on the tree. Then he doesn't work out at the combine and people start whispering he's hiding something.
Bottom line, the football people really already know pretty much what they need to know about Vince Young. If they want a personal workout (as the Titans apparently do) they get it.
I've said before I think the Texans are fools to pass on him, because he alone has the chance to be the mold-breaker in the NFL. But I agree, it's a terrific risk. Maybe he'll only turn out real good. Or worse, a bust (though that seems far-fetched even to his most avid haters).
The Texans real difficulty is they don't WANT a brilliant QB under Kubiak, they want a pretty good, careful, sufficient QB. Under Kubiak, the SYSTEM is the thing. Once you understand that you understand why trade down is the only route to take, why Sage Rosenfels makes sense, why Carr is kept, why the middlin' players who really are pretty good are picked up in free agency. Kubiak does not want stars, he wants a workaday team that executes the SYSTEM.
And THAT is why we're not drafting Vince Young.