Ya so rapidly that he fought at 155 from 2005-2009 (16-19 years old) moved to WW before turning 20...
Like Jon "Roid-monkey" Jones, your body fills-out as you age, he has a big frame and could handle the move to 185..he's 23 remember..when it comes time for the title-shot he or GSP will be making a move...
Is this supposed to be some sort of litotes?
Yes, 3 weight classes in last then 7 years is extremely rapid. Especially considering he had little musculature at 155, even in his later fights at 19, and now he's some heavily muscled freak.
Anderson Silva started his career at welterweight and didn't move up to 185 until he was 29 years old, the normal years people start to peak physically....not in their ****ing early 20s.
Also yes Jones started his career at 205 at 18 and is now at a whopping...oh wait he's 25 now and he's still 205lbs.