My source, who spoke with some people in the Texans front office, said that right now, the the NFL scouts grade out Manziel and Bortles relatively the same with Teddy being slightly below them. If the Texans are partial to any one of the three they may try trade back and still get the player they want. All the teams are playing games with who they favor, he was told don't believe any of it as they are all sending out info to try and figure out where the other teams are leaning but not to bank too much on any of it at this time. He was also told if Manziel knocks it out of the park Thursday there could be some real info leaking as to the Texans decision. If not and he remains in the pack we may not know their intentions until draft day.
Take it for what it's worth, but he's been pretty spot on with his info.