Weird thread. Wand had one TKO loss all the way untill he fought CC, nearly 40 fights and a decade into his career.
Aldo got polished off by Conor 26 fights and a decade into his career too. His losses to Holloway IIRC were more him gassing and eventually being dropped and TKOed by a million rabit punches on the ground, won't even bring up the Yan fight.
Not sure if you consider Arlovski and Mir as ATGs but they were knocked out consistently throughout their relevant careers, but HW power and mass is on another level.
I guess Randy did too.