I just checked the replay for Cybran vanilla 6 (Freedom) rank 1 player, Pobus, because I wanted to see what kind of strategy they had to beat the former number 1 by over 2 minutes.
The answer is simple, as the title implies, that guy is cheating. I'm not sure how many people care about coop leaderboards, but I do, and I thought I'd report it cuz I'd like it to stay clean.
You can't see the player's ressources outputs in coop replays, but I've played that one enough times to know you can't just build 20 air factories and have them pump out fighters without stalling, while building dozens of Soulrippers. So if that guy's replay could be removed from the leaderboard, that would be neat. I liked being number 2
Thank you for your time !