WTF is a sponger? If it means what I think you insinuated then it was just a very ignorant comment.:deal
Golovkin is a beast. A knockout machine. No on can beat him. Kovalev is an other weight though, unbeatable around his weight as well.
Golovkins trainer made it sound like Kovalev was scared. And that Gennady was having severe headaches after sparring with Kovalev so it stopped.
Kovalev has a huge respect to Golovkin who has much better achievements in amateurs. In sparring, Golovkin takes things seriously, and Kovalev didn't want to do the same, because he didn't want to hurt GGG.
Calm down essssaaaaayyyyyy Sponger is a British colloquial referring to someone living off a host without contributing a great deal back.