I agree,
With Blademail being nerfed, and bkb now properly working with ursa's buffs, additionally removing casting time on overpower, wasn't really needed. Personally I think it's part of Ursa's charm that you had to load your buffs before going in, else your opponent might escape due to the casting time. But if you timed your buffs well, the enemy would likely to die.
In SiG Ursa was annoying to be against due to the roshan kills, now he's rather a must pick similar to TC before he got nerfed, cause you really don't want to be against a pre buffed ursa blinking in with avatar.