ETA:
From TV Guide online...
I need some CSI finale info. How will the characters react to McKeen's return? — Mark
ADAM: Few CSIs have more animosity toward McKeen than Nick, so he's the one to keep your eyes on. In particular, look for Nick to crumble when McKeen's scheming brings the team's credibility into question. "By the end of the finale, Nick will be in a place where he's questioning how the wheels of justice work and also questioning his role in that system," executive producer Don McGill says. "It will bring him to an existential crisis where he really, really contemplates whether or not he wants to be a CSI anymore." Hmm... George Eads is heading into contract negotiation. Say it with me: Eek!
This bit of info sparks some more interest for me. Wonder how the team's "credibility" will be put into question?
Maybe it goes back to the Haskell situation last year