He is going to gas out hard. If he thinks coming in 270+ and trying to bully Usyk is going to work, it won't. It may work for a few rounds as Usyk will be forced to back peddle. But once Usyk starts landing lefts, fights over.
Hard to tell from that photo what kind of shape he is in. I do expect him to show up in top shape (for him) however as he knows how much is riding on this fight. If he wins then he is once again the king, if he loses then he is firmly in 2nd place for the era.
It may be the right decision though, for the reason you provided. Maybe he knows he can't beat Usyk on points over the full 12 and is putting all of his eggs into getting a stoppage.
He looks the same as he always does. You're never really going to expect him to look anything different or even close to the guy on the left of him. Fury just has a bizarre physique in general.
He's coming tad over 260 again Fury is not a fool he knows is fight against Usyk and Usyk knows his fight and a close one it will be.