1) We are talking about Civil court, whole new level of "proof".
2) Texans head of security supplied him with the NDA agreements.
3) Jack Easterby, a very unsympathetic character and people directly underneath him set up the Houstonian situation for Deshaun and provided massage tables to it.
4) Ownership at the Texans is decidedly brain dead, has very deep pockets and once again would be a very unsympathetic witness.
No, they have enough in civil court to go after the Texans.