Theory (This will only make sense if anda have read 530)

This is what I think will happen:

Isshin (Bankai Form) vs. V.L. Hollow
Masaki Arrives and scares hollow away (With Quincy Bow/Arrow)
Masaki heals Isshin and they start forming a relationship
Years later (Masaki is pregnant with Ichigo) hollow returns attacks both Isshin and Masaki (Explains Fullbring + Hollow Similarity)
Isshin uses Final Getsuga to Kill Hollow and loses all his powers

Ichigo inherits mostly Shinigami & Hollow powers (Very little Quincy)
Karin inherits Shinigami powers but no Hollow
Yuzu inherits Quincy Power