Assuming he'll have courage to fight outside of Germany How would he do in this era of boxing? Honestly.
I think he'd be a top contender. No doubt grab a belt or two. I'd have favored Beterbiev and maybe prime Kov over him.
One of the biggest let downs in light heavyweight history was him and Roy Jones not getting it on. A total stain on both of their careers.
I don't rate him as highly as most, I think RJJ world have beaten him easily, and I think prime Beterbiev, Kovalev and current Bivol all beat him
Top contender probably picks up a belt or two, but guys are going to have to go to Germany to fight him.