not that much weaker. the 3rd raikage kept his alive bodies resilience so yeah
Then Edo Madara happens stronger than SM Hashirama
Then Edo Madara happens stronger than SM Hashirama
It depends on the skill and power of the jutsu user. The first time orochimaru summoned the kage, they were a lot weaker than the versions he summoned later.
Depends of the caster of Edo Tensei. At best they can go close to full power. So Edo can only go about 1-15% percent weaker then their original.
Edo Madara cannot use Rinnegan at its full power. As the Renningan is fake, when dead.