Just my 2 cents about the 2 brs story : that is possible to chain 2 brs but you ll have to slightly touch the ground between the 2, otherwise it seems impossible ( at least to me)
I can chain 2 brs on the final straight of vineta frwd ( thx Christian to show me the light ) but i know i touched the ground.

Like Xavier said on a jump you can t BR twice in the air or someone will have to show me the vid ( zico's one you mentionned Christian, the ship clearly hits the ground between BR N°2 and 3)