As someone who started skating in the mid 80s, Grosso can say that street skating was manufactured but the fact was 98% of America was never going to see a vert ramp. If you owned a skateboard, chances were you would never ride transition.
Of course seeing Gonz, Guerrero, and Natas gave everyone direction but to not give Mullen credit for inventing the flat ground ollie, the basis for all modern street skating is absurd. Especially after going out of his way to credit Jeff Tatum and Monty Nolder as the originators of backside versions of existing tricks, his treatment of Rodney seems super petty.
Grosso can't ollie, confirmed.