Why did Conor Mcgregor look so much healthier at 145 early in his UFC career?

Conor looked so much better health wise at 145 pounds when he faced guys like Max and Marcus but then as the years went by it seemed as if Conor was almost dying to make weight and even after weigh ins looked a bit smaller in the cage. Is this something that just happens to all fighters in their career at some point or is there some other explanation hardcore fans can clarify. Sorry if a shitpost.

edit: I think i figured it out. His last fights were during the IV ban when you couldnt weigh in in the morning like you can now. He should look much better next fight.