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Cao Cao always remained cautious of Lyu Bu, and that's why he was not particularly keen on the suggestion from his trusted Xun Yu, considering that Cao Cao didn't feel any sense of crisis at the moment.
Think about it, Yuan Shu, who bragged about beating the whole map, is now facing Cao Cao upfront, and Cao Cao realized that he seemed stronger than his opponent in every aspect, from the commander-in-chief to strategists, from military generals to soldiers. After engaging with Yuan Shu, he discovered that if he went all out, he could easily squish Yuan Shu into a mess without any problem!
That's why Cao Cao was not interested in Xun Yu's proposal. Without any sense of crisis, Cao Cao had no interest in keeping a ticking time bomb close to his chest. As for Diao Chan, as someone with a particular affection for married women, Cao Cao had to admit he might not have been interested before, but now that she's become Lyu Bu's concubine, he's become interested...