i agree. i like all the pairings in DC. as for the childhood friends couples, every couple has different stories that makes it special.
for example:
1. kobayashi and shiratori only met once, they didn’t even know each other’s names
2. naeko and chiba had lost contact for 13 years and he didn’t recognize her althought now they work in same department.
3. Yui married somone else and when her husband died, it allows kansuke to start all over again with her.
See? Every couple has their own twists. All of them should get equal attention, I think. Hehe