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You make it sounds like it's hard to find a use for him
I don't have much experience with him, so it kinda is for me, lol. But I already have A. Cao Cao, so Idk if I should work this one up to the same level or what. Maybe double A. Cao Cao on a Krishna Row team? Idk.
Make the second one into R/G and use as a TPA sub.
You could also always inherit CaoCao onto himself for a cheap delay resist :)
I've seen that some people inherit like monsters onto themselves, but I never understood why.
It's a cheap delay resist latent if you have dupes to spare.