>>281599692
I thought you might make that comparison but shadowrush is performed at a low stance and ends with a ground slide so it makes perfect sense that you can mikiri it.
Malenia's thrust has her arm up and extended AFTER jumping. Even if she were Owl size (she'd probably be bigger like every other boss), it'd look off.
In any case, that's still just one (very awkward) thrust attack and no sweeps, I just don't see her as a Sekiro boss. You could as well say Maliketh was supposed to be one too cause of his destined death barrage.