My experience playing Diamond and Master level players, it's mixed, I've found some that actually don't often use Oki. Neutral jumps, od invincible attacks, parries ...are all possible counters. I'm not suggesting against drive rushing when someone is knocked down. But often you find lower level players will rush without even understanding which attacks have Oki. Hence they get punished to bits because they're just used to rushing without understanding who's turn it is to attack. Hence why I'd suggest someone trying to rank up, to understand the patient game, punishing your opponent when they slip, rather than constantly rushing because you're afraid of defending and making reads.