Not sure I'd bet on LeBron being too fatigued. Dude is a machine.
26/10/5 on 50% shooting. Lebron wasn't the problem.
Again you’re missing the point. Nobody is saying that he’s the reason they lost. Poor coaching and awful starters (Hill, JR and Thompson) were key reasons. But LeBron has never looked like this before, and wasn’t nearly the frightening presence at the end of the game that he usually is.
Like I said, Lebron will still put up stellar numbers in Game 6 and will likely look fresh early on. If we make him work for everything again though (both offense and defense), then he could look somewhat sluggish again in the 2nd half (as @gouki88 said^). That's our opening. No guarantee we win but we got a chance as long as we don't start off very poorly (or make too many dumb mistakes like in Game 4).
Lebron is no doubt a machine, but some machines also start "acting up" a bit or show some signs of weaknesses/deficiencies through wear-and-tear and after extreme usage.
I'd be surprised if Lebron played 40 minutes tomorrow night and didn't look fatigue/tired after about 30 to be honest. Not like there's a whole 3-day break again this series.