He's obviously not elite top 10 professional boxer. He did strike gold with his split decision loss to Tyson Fury. Fury is an all-timer and J. Anthony is an elite HW boxer with plus power over the past 8 years. Losing to them takes the shine off but Ngannou can definitely be competitive in the gimmick fights that are so popular these days.
I know these opponents I'm suggesting are ridiculous and maybe even irresponsible, but if you don't think this is the kind of crap that sell these days, you probably was one of those guys who was 100% sure that Mayweather vs. McGregor would never get approved by an athletic commission.
Ngannou could box a Chris Arreola type - totally washed HW, or cajole one out of retirement like Steve Cunningham who last fought Frank Mir. Though the best one would be Jake Paul at a catchweight like 250. Yeah, ridiculous right? But THAT will sell.
Go ahead and tell me that's impossible matchup that would never happen. Like a Jake Paul vs. Mike Tyson? Or a McGregor vs. Mayweather?