wingthesword said:
Towards the end of chapter 171 is a good place for Kenichi to give up on Miu.
And the situation you presented wouldn't work anyhow. Does any of them know Shou? No, they don't. Would Kenichi have any inclination to suspect that Miu does? No, because he lives with her. The other masters, who already knew about Kenichi's affections towards Miu, actually would have given him the heads up if there were any past paramours standing in his way. So there is no reasonable explanation for him not to call out to Miu.
And even if - IF - that was to work the way you think, it simply means that the Shigure/Kenichi road trip would have to occur earlier for any story to progress. The effect you'd have engineered would be like the canon event where Kenichi completely lost his will to fight.