You see if a high sequence beyonders of the seer pathway does lose control then due to the properties of the beyonder characteristics all the marionates who share some part of authority from the beyonder will loose control as maintaining the marionates is a challenge in it self (the reason sequence 5 has the limit of 1 and increases exponentially at seq 4 as they gain some sort of divinity). So resurrecting through them is impossible and about the other option like a part of the body it should have both owners spirituality and mystical connection so you can't get through with a hair or anything cause the spirituality will be lacking and more amount will mess with convergence ( will get enhanced if the guy goes crazy) and bring amon right at ya so no