first, let me start by saying that he is the best fighter ever.
2nd, he looks pretty bad in that video, but obviously, we don't know when in training this was taken etcetc. With that said, it doesn't look good.
3rd, you guys act like fighters are supposed to stay in peak form forever. they don't. most mma fighters last at the top of the sport (if they ever get there, which I would venture to say 99% do not) for maybe a couple of years. People were praising Weidman as being the best MW ever after he beat Anderson, Machida and Vitor. Now, he's not mentioned or people are saying he was always a dud (mind you, he's lost to 3 of the best in the world before beating Kelvin). What happened with Fedor is normal. He stopped training as hard, he actually retired for a while. He's not going to be who he was a decade ago. Would still like to see better footage but, we'll find out come fight day.
4th, i'm not sure why this video and thread sparked this in me but, Fedor has slowed down tremendously after being at the top of the sport for a long time. Lucky for him, he is fighting at HW, the least skilled division in MMA. I have even more respect now for guys like Frankie Edgar. He has fought at the highest level for a decade, in some of the toughest divisions in MMA, where losing even a TINY bit of speed or reaction time will likely end your reign at the top. Instead, Frankie somehow has gotten better over time. Kinda crazy.