I don't think Edo Tensei bodies have unlimited chakra. (Even thought he split himself in half) Kabuto said it would take time for Muu to regain his full prowess. One half of infinity is infinity, so.....What im thinking is if edo ninja's really have unlimited chakra he can more or less stay in susano like forever and spam tsukuyomi and amaterasu and yasaka magatama and his usual genjutsu.
Unlimited chakra is the deciding factor here i think, not to forget the totsuka sword
Terrible explination, I know, but I do not beleive Edo Tensei zombies have unlimited chakra. They can't naturally die, and their bodies constantly regenerte, but they still have limited chakra.