i just thought, if i made an NPC in the CK with Dead Thrall, than killed that NPC and thralled them, would they in turn Thrall another NPC?

Does Dead Thrall require 2 hands to cast? If so neither followers or npcs can cast it, or any spells that use both hands for some reason. I'm not sure if there are mods that can change this, despite RotE giving enemies unique spells that use both hands~

It seems every single time i find a thrall i like, and upgrade with smithing/enchanting skyrim has to take it away i never use named 1s as there often unthralable ,weak, or non permant , so whats up. They either disapear or i leave there body in my lair , and there gone when i get back realy get tiredof this its hard enogh dealin with serana dust piling arything with her weak necromancy. Should i use breezeway for body storage? Do they stay there?

I have no idea what you're asking.

Do you mean Breezehome? If so... I still don't know what you're saying.

Yes. Thralls are glitchy. You can store them in your house. I would recommend you check them every 24 hours so they don't disappear. There is a great character build to help you keep track of your thralls. Go to the skyrim blog, character build section and look for Mason's "Rise of the Fallen"