Clearly? He's just struggled with Danny Jacobs. Hopefully, you're joking. I'm a big fan of GG's, but it's guys like you who make it so hard for me to engage people in objective debates.
What else do you expect from a poster with a name "ZablieJudahnoff"? Clearly some sort of troll or alt.
H2H there's plenty of guys who you'd have to pick to beat him based on the evidence so far. Danny Jacobs took him all the way, which means he'd lose to Hearns without a shadow of a doubt. He'd lose to the true ATGs at the weight, Monzon, SRR, Hagler, etc, but that's not much of a discussion. I'd take SRL to beat him, B-Hop would be a good fight and I'd lean towards B-Hop. RJJ would beat him. In terms of guys you'd class as career MWs though, he's high on the list.