Kovalev getting slumped doesn't really mean shyt to me cause we seen a gang of fighters suffer from devastating beat downs in that division. The fall off was spectacular, but even in his decline Sergey showed some wrinkles when he was able to successfully reinvent himself from being a puncher to boxing more conservatively.
He's a very skilled eurocac. I more or less remember Stevenson ducking him, too.
That being said, might give the edge to G. Packs mythical power, strong jab, solid chin. This might be a case where G gets the benefit of the doubt because he was unable to make higher profile fights.
Beating on a small Cotto or crippled Martinez wouldn't have meant much to me, but I do wish he would've been able to fight a Charlo, Andrade or even Lara type of opp just to further gauge how great he was.
Some interesting recollections:
Both G and Kovalev's legacies are enhanced by fights that they didn't win. Kovalev's controversial loss to Ward, and G's controversial draw with Canelo.
G tied Hopkins' consecutive middleweight title defenses record, while Kovalev beat Hopkins.