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This is the entire group. That Ino and Neko were just 'friends' is highly unlikely. The reality that Ino and Neko for 20 years hated each other so much that they would try to kill each other on sight because of what happened to Oden and that they risked annihilation purely to save Raizo, speaks volumes. I mean this is really not an institution that has to have nine members, but they were called like because they were with nine. How they became part of the group seems of little importance.
That Ino and Neko had another home they could return too, is not really that important either as in the end there was no overall plan they decided on, at least not that we know of. There were rumors, surely, but I think Shutemnaru described that as trying to catch the shadow of a ghost or something along those lines. In the end each individual had to decide for themselves what they were going to do. Based on what we know Ino and Neko were already separated from the group in Kuri castle. Oden was dead, Toki was dead, Kinemon end co disappeared and Hiyori was presumed dead.
As a member of the Nine, they were definitely high on Orochi's & Kaidou's hit-list. If caught it either meant joining him, imprisonment or death. So if Denjiro really had a family, choosing exile is a rather smart choice, especially because in hindsight he lived a rather peaceful live in East Blue (with the exception of Kuina's death, I reckon the theory that she was murdered is going to go through a resurgence). That definitely beats the lives Kawamtsu's, Hiyori's and Shutenmaru's lived in the mean time.