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Cao Cao's thoughts were completely unknown to Liu Bei's side, and as for Cao Cao reclaiming Yanzhou, Chen Xi and the others didn't take it to heart.
Previously, the eastern part of Yanzhou was abandoned by Cao Cao himself, and after he abandoned it, Liu Bei couldn't even be bothered to occupy it. After all, for the current Liu Bei, it's less that he lacks territory and more that he lacks people. So, he had little interest in the vast swathes of land in Yanzhou. With Qingzhou still not fully under his control, it made no sense to disrupt the pace and occupy Cao Cao's territories; thus, the eastern part of Yanzhou remained overgrown with vegetation since 192.
As for Cao Cao's uninteresting behavior, Jia Xu and the others unanimously scoffed at it. And concerning whether Cao Cao would come to stir up trouble, not a single one of them was worried. Did they really think that the large army Yu Jin stationed along the edges of Mount Tai was just for show?