One thing I for sure, there is very little to no science placed in the nutrition of either MMA fighters or in boxing. So the "and still do it for a reason" doesn't hold water (no pun intended). While everyone else is struggling to re-hydrate the times after the weigh-ins till the fight, my guys are drinking there water and pedialite while there WAITING for the weigh-ins not after. You guys seem to forget that muscle is still 65-70% water and even when re-hydrated quickly it still isn't enough to fully recover especially when your eating, sparring and everything else thats done before a fight. Nerves take a toll sometimes so much on the CNS that even though you THINK you're re-hydrated you quickly find yourself week before the sound on the first round bell.
You seem to forget, I actually do it and it works for me. It may not for everyone, but it does for me. I don't THINK I'm re-hydrated, I know I am, cuz I put back all the water I lost, as evidenced by the scale and urine color. And since that leads to the inevitable questions about who I am, can I beat up GSP and Fedor, am I just making this up, it works for Matt Kroc too, and he drops a hell of a lot more weight than I do and then comes in and sets PRs, so I don't think he is mistaken about it working for him either.