Kou and Tatsuya are indeed similar (as I would assume most of Adachi's characters are). It seems to me that the difference is the audience's relation to them. In Touch Tatsuya was basically the narrator of the story, and this is made very clear. In Cross Game though, we seem to be a little more detached from Kou and his mind, he is a character in the story in the same way that Aoba is - someone we observe from the outside and interpret.
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