Keegun's only champion that he is (mainly) playing for several seasons is Pantheon and in the past he had multiple accounts maintained all togehter in Challenger. Also, he is updating his guide on Mobafire very consistently and provides the most important information about Pantheon.
Here are Keegun's complaints that he posted on Twitter:
Problems with Q:
Lower reduction from hold Q | 50% > 25/30%
base AD ratio from 100% to 120-140% (140% was the old Pantheon's Q)
Can put execute on tap Q as well to remove clunkyness
[Extra] Buff the range back to 600 if you did not do those buffs
Problems with W:
Goes up by 20!!! dmg per lvl and -1cd
Garbage scaling, at lvl 13 scaling ends
Ability can be dashed (like old Reksai R); Pantheon is already immobile, so if they can dash out of it, he's useless
Emp W ???
Problems with E:
- NO DAMAGE! LESS DAMAGE than an auto attack, therefore buff bAD ratio
Problems with R:
- Can not cancel Ult anymore; LOWER DAMAGE than old R; higher cd too