Interesting twist, maybe pick up radius could reduce the yard requirement like grave injustice boosts it. For strafe/vengence you wanna be close, but not too close.
If they wanna make this a fun build they are going to make the useless shadow power thing a 2pc bonus and make the 4pc something like reduces cooldowns by 1 sec for each enemy killled/assisted. Like the wd's grave injustice. This would open up strafe/vengence builds that would compete with m6.