@Kelsey_Instagrammer ,
I just looked back at my DCM devices on my auxillary Sense unit, and I do have two native Heat detections that correspond to parts of my floor heating sub panel. So, yes, detections can happen, but you can roll those detections into the DCM device to avoid double counting if you find that they are associated with a DCM device.
It looks like this is another recent case of Sense doing a native detection of a pool pump that is already on DCM. So yes - it can happen.
ps: I couldn’t go the double wire approach in a single CT route you are contemplating, because I had too little play in the big fat wires leading to my floor heating subpanel. But the physics says it should be accurate as long as you get the directions/phases right.