u/International_Bit665

First case
Hashirama > RSM Madara > Rinnegan Madara (hypothetical)

A > B
Hashirama > RSM Madara: Hashirama is stronger because he has a jutsu that can restrain Madara by reacting to the Hashirama sage chakra within him.

B > C
RSM Madara > Rinnegan Madara: RSM Madara wins due to the Sage Mode buff.

C > A
Hashirama would lose because he cannot see or sense Limbo.

Second case
Hashirama > EMS Madara > 8th Gate Guy > Hashirama

A > B
Hashirama > EMS Madara

B > C
If Madara uses Izanagi with one or both eyes to become invincible for several minutes, Guy would die from the side effects of the 8th Gate.
(This assumes Madara can use Izanagi even without having Hashirama’s flesh in his mouth.)

C > A
8th Gate Guy > Hashirama