Talk:Excalibur/Umbra/@comment-28905573-20160819013736/@comment-3410662-20160904033035

I don't think the Stalker is independent of the Reservoir. In one of the Second Dream cutscenes, spoilers, Hunhow speculates that part of the reason for the Stalker's refusal to kill the Tenno Operator when it had the chance was that it suspected it was in there somewhere.

Keep in mind that if the Stalker was independent from Tenno control, it wouldn't have any powers; those originate from the Tenno's connection with the Void. The whole purpose of a Warframe is to act as a conduit through which those powers can be channelled productively.