I was thinking the same thing... That maybe Hikaru's father's misisng to make room for Sai as a guidance figure. Then again, if I understand Japanese society correctly, there's already room for that in the form of homeroom (and other) teachers, so maybe it wasn't necessary just for that.
Onkoona makes the point that it's not unusual for someone with Hikaru's Dad's job be be gone all the time (and I'm not sure Hikaru sees Sai as a male role model), but it still seems a bit odd - maybe because there are few absent fathers in shonen manga? Who aren't dead, that is.
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