Yes but barely

No

Yes.

No.

Maybe.

Yes

Yes. He slightly loses without Susanoo, but Susanoo scales above the user. Gaara also can't even scratch it. It is shown in Generations cutscene.

If Sasuke kept using the Susanoo Gaara might have just stalled him out until he went blind.

Probably

Yea but he probably would’ve lost or went immediately blind when fighting danzo