If seeking a QB with their 1st pick, they trade down. Even Garoppolo is a really talented QB and he's 4th or 5th ranked in list. Gonna be a little hard to find a trade up partner with so much talent at key positions and not much separation between the top 3 players in each (minus Clowney). Not to mention the great depth of this draft overall. Unusual number of projected 3rd and 4th rounders who will be very solid pro starters. Not a wise move to surrender a bunch of picks in this one if you are a subpar team needing more than a few pieces.
Still, my hunch is O'Brien likes Bortles most but not 1st overall. He also has an alternate QB choice in mind beyond the Big 3 if it comes to that. Sure he'd like to build his team with a bigger assortment of his own guys that fit his style.
In the end, someone takes the bait and Texans trade out. The team going up is either targeting Manziel or Clowney, athletic freaks at their position. No way I see someone in the top10 mortgage their draft on Bortles or Bridgewater. Neither is close to an Andrew Luck type of guarantee. Manziel isn't either but I know his flashy play has wooed someone to fall in love. Not O'Brien. Anyone sitting beyond top10 would have to surrender this year's draft and some of next. Not happening this year.