Gennady Golovkin vs Sumbu Kalambay At MW

They are contemporaries yes,but are either ever considered as top15 ATG's?

 

none of them are surely.

 

Hard to say, this one. On one hand, Kalambay was a better mover and boxer than anyone GGG has faced. On the other, he was smaller than both Jacobs and Canelo in the ring, as well as GGG himself, and didn't have their punch or chin.

To put too much emphasis on how Kalambay fared against the likes of Kalule and Nunn is too Boxrec centric, since they both were vastly different stylistically from GGG. Brook and Jacobs are closer to Kalambay, at least when they fought GGG. Kalambay was superior to Brook in every way really and to Jacobs in every way except size and power. So does his superior skill mean he would do better than Jacobs or is it that ouweighed by Jacobs's superior size and power? Don't know personally. Would be a very interesting fight.