I thought support mastery changes landed this patch?
Apparently 4-3-23 with 40 wards placed, 123 cs, and more damage than our adc isn't a solid B+ Sion support.
Don't forget that after Ashe gave FB she went mid, because of my Sion support, so yasuo came bot with me -- the person who carried was fed because of me.
In fairness, I do have to credit Ashe with the game-winning arrow onto Ahri, which let me get ahri in my ult and the subsequent wombo with Yasuo.