I wonder if Dead Demon Consuming Seal can be performed by a clone and only affect that clone?
I think it depends on the type of clone technique used.
Muu split himself in half, which also corresponded to reducing his chakra, strength, and all that jazz in half.
I think one half of Muu might be able to perform Dead demon seal without screwing up the other half.
Regular clones probably can't do that. The third hokage used regular clones to target the first and the second hokage. He probably could have outrightly sealed orochimaru if he had a little bit more physical stamina, bit, he was an old man impaled on a sword at that point, so... we;ll hafta settle.