Meddler, please
"takedowns on the villain generate 1 extra courage stack that doesnt count towards the maximum"
hes generally in a ditch right now. a slight buff couldnt hurt. its a buff to his lategame thats not going to be crazy or affect his laning/snowballing (shouldnt be more than ~10 extra armor/mr at 40 minutes).
do it.
another possibility would be to put a soft cap on his w, like threshs passive. technically no limit to the stacks he can build, but gaining less and less resistances off unit kills.