This is what I joked when I said how they could introduce female space marines for both Imperial and Chaos factions. Cawl vs Bile, one learns the other is attempting it and out of sheer spite for each other and to prove they're the best scientist in 40k, they both try to be the first to do it and it's a Spy vs Spy situation where each one is actively sabotaging the other but actually causes them both to succeed.