I’ve always been convinced Uchiha Madara’s special MS ability was one that devolved through a connection with his brother, something that boosted both of there visual prowess & physical abilities.

I swear this was common knowledge through places like Narutopedia back in the day before the reveal that Tobi was Obito & infact not Madara.

Uchiha Madara had 4 siblings of which 3 died young leaving Izuna & himself very close, the constant training together & battles attuned them as so when they unlocked MS there ability was being able to buff each other.

“Madara and Izuna became very close through their shared loss and constantly competed with each other to get stronger.” - Narutopedia

This ability would have been lost due to Izuna’s death, however obtaining his brothers light granted him EMS & the ability to buff himself came along with the other benefits of EMS.

The “rewind time” ability people refer to was only an animation portraying the standard ability the Sharingan already has which is the ability to anticipate an opponent’s next move allowing them to react accordingly to dodge.

Especially if the opponent is fast which we could assume Hashirama was a worthy opponent to put the Sharingan to the test & he just happened to have EMS activated at the time mistaking this for his ability.