A well considered rework +1.
However, I reckon IF we turn Shatterpoint into a non-dispellable, non-copieable unique buff that he can gain at the start of his turn, this will remove any overpowered pairings with Resistance teams that heavily utillize Expose. However, If we make him weaker he will still be a bit mediocre even after the updates.
So as said, the Unique buff Shatterpoint could allow him to ignore Stealth, Taunt and deal bonus health % damage in addition to giving him turn meter. Reason why is if I am correct, only Mace utillized Shatterpoint so it should be unique only to him.