I’m not sure if anyone posted this before but usually you cannot have two fireballs/EX fireballs on the screen at the same time but if you throw an EX fireball up into the air you can throw an additional EX fireball or a normal fireball of your choice.
Also the motion for his hcb+P grab is not really f,d/f,d,d/b,b+P, it’s f,d,b+P.
Oro can also dash under certain fireballs if timed correctly. It’s hard but possible.
I mentioned this in my other Oro post but Oro can dash over certain characters while they are tech rolling. Here is a list: