Draven Ult Cost still 120 Mana!

Draven's ult costs 120 mana, which seems too high. In the recent past, many other champions have had their ultimates lowered to 100 mana across the board so why should his remain at a higher cost. Even a direct comparison to other global ults on marksmen shows that his is higher for no apparent reason. Draven's ult has the ability to be called back unlike the others, but it also has the drawback of automatically returning if it hits an unintended enemy champion first. Ezreal's ult costs 100 and can pass through unlimited targets, just decreasing its damage dealt per target, and Jinx's ult, 100 mana as well, explodes on contact and ramps up in damage over distance. The advantages and drawbacks of these three ults all seem to be equivalent overall so I cannot see why his mana cost should remain at 120.