It's actually incredible how dumb you need to be thinking that coming in fatter and more out of shape is some kind of advantage. Yeah I'm sure fat Rampage Jackson was a far better version of himself than his prime!
Like holy fuck.
A reasonably big MW who stays in shape with training, but comes in 5-10 lbs heavier than usual due to not knowing he has a fight coming up, against a small MW. 215-220ish vs 195 on fight night, yeah how could that ever have any kind of advantage, right?
It's not black and white, it's not 100% advantage or 100% advantage to his opponent.
Cardio-wise? Disadvantage, but he already has great cardio in general. Power/chin? Advantage. Defending takedowns, defending in the clinch? Advantage.
Strickland used it to his advantage, Tyson Fury-style, to lean against Imavov against the fence for 4+ minutes during their fight.
And the short-notice works both ways, neither had time to do much specific game-planning, but Strickland usually just has the same style regardless.
Not sure where Rampage fits in to this topic?
Strickland literally had a (5-round-)fight vs Cannonier 4 weeks prior. How out of shape can you get in less than a month, if your name isn't Paddy Pimblett?
Rampage was out 15 months and was 41 years old.