With Entwined Power, can Shroud of Silent Mist Gather another Spirit's Presence?

With Entwined Power, can Shroud of Silent Mist Gather another Spirit's Presence?

Yes. When Shroud of Silent Mist targets a Power (which its Presence-Gather is part of) it treats the other Spirit's Presence as also being its Presence.
If the effects of the special rule didn't have anything to do with targeting the Power, it might be more ambiguous (since Entwined Power is only supposed to affect targeting), but Mists Shift and Flow is very explicit that it can be used to target Powers.