SAM cast times in pvp just don't make any logical sense. Its fine in pve, but throwing cast times onto a melee in pvp is never a good thing unless the burst justifies it like how it was for sentinels in swtor with master strike, but that was a 3 hit channeled skill that hit extremely hard and did damage during the casting. It also rooted the opponent in place.

I think leaving cast onto ogi namikiri is fine if they increase the potency on it, but midare probably shouldn't have a cast time in pvp. SAM isn't really bursty enough to justify a melee having to cast so much to burst. Majority of the time when a SAM jumps me I just walk away from them or CC them real quick as I'm really never worried about their burst since its a super obvious cast animation with an extremely loud audio cue.