I'd say the probable choices are Jay Nady or Kenny Bayless. Cortez would come with huge objections from team Hatton.
Still there will be excuses and I can see them already. "I know Hatton was losing early but as soon as Cortez replaced Vann it just completely ruined Hatton's chances as he clearly planned to weather the early storm and take over late!" And that excuse will be there even after Hatton is counted out on the canvas.