Gyro isn't a Jobro. He's the main character. Johnny is the Joebro of that part.

^ aren't they both sharing the main character role?

Well, in the manga, Gyro gets actually called "Our main character". I don't think Johnny gets that.

^ do we know that for 100% sure even though part 7 hasn't been fully translated yet? also Johnny is still a Joestar even if gyro is the main character

In fan translation, it is. But either way, it shouldn't be long. The first volume is where it's said I think

Speedwagon for the win, he's just THE Jobro fr

SPEEEEEEEEEEDWAGAAAAAWN

giro pliz