Sion/kalista interaction

the passive on sions W allows him to gain bonus health when he kills a minion. If a kalista binds to a sion and sion use's the mark passive on kalista's W to last hit for her, sion DOES NOT gain the bonus hp. While i understand that there may be a reason for this and it kinda makes sense, i'd kind of like to see it changed to work so that he still gets the health because even if he isnt getting the creep score, he still is the one who is going through the action of auto attacking to kill the minion. just something to bring up at the next sion meeting over there at riot