Don't know much about him at all but am saying a lot of t2/t3 players i do know on twitter hyping him up like crazy. Also, I made a post the other day talking about how boostio was mechanically horrible and still never put in the time to play ranked (literally 10 hours a month the past year) or play dms which he never did at all.
I just looked at the tracker of Kess and this dude has almost 1500 hours in just death match alone and another 100+ in TDM. This isn't a tell all but its definitely a good sign that he is a grinder and cares about/has good mechanics.