You reckon,I think he'll find out Eubanks power which is often used in his relentless uppercuts,only Eubank won't be able to get near enough to use his uppercut as Golovkin will be on a Jabathon to beat his record versus Lemiex,Golovkin is smart,if he believes Eubank to be threat he'll just box"cause this is boxing"and to my knowledge Eubank doesn't have much in the way of a jab? Eubank Jr does have a good engine though you're right and is super fit.
I'm basing this off basic boxing history. Most boxers are on their way out by 34. I expect GGG to age quickly in Boxing terms.
Golovkin has a high boxing IQ, his tactical style and his power will enable him to continue knocking people out well on to age 39, until some random Gypsy outpoints him.
I seriously doubt ISIS wants anything to do with Golovkin, they are more focused on preserving their own Caliphate and causing destruction to the White Western Anglo Saxons. On a more serious note, Golovkin's loss in reflexes can be compensated by a high ring IQ.