Yeah and that's only because Oda never really introduced the other CDs but things are different now, we are now in the final saga and getting even more focus on the World Government.
We are focusing more on the Five Elders who are CDs, we are soon going to get more focus on Garling and the God's Knights who are also CDs, and soon Oda will show us some other CD families.
The whole it must be someone from the Charlos Family because they are the only ones that got focus is just a bit dumb.
Well we don't for sure if Garling's wife was alive during that time or not, and it's not like some of these CDs like Garling would care if they are married or not.
Someone like Garling for example could have his main CD wife and then have a bunch of sex slave wives.
I said "probably" not "must".
And if you want me to go into more detail then fine. When Bonney was first introduced, it was during the chapter where she stopped Zoro from attacking St. Charlos.
Fast forward to the Reverie arc, when she was reintroduced into the story, and it was during the chapter where St. Roswald showed up riding slave Kuma, to inquire as to who attacked his son, St. Charlos. And in that very chapter Bonney swears not once, but twice that she will make St. Roswald pay for what he was doing to Kuma.
Mighty big coincidence that in both Bonney's introduction, and in her reintroduction, each chapter involved St. Charlos, and in the second instance St. Roswald was even riding on top of Kuma as a slave.
Oda went out of his way twice to draw Bonney in the same chapter involving Charlos, and even had her swear revenge on his father the second time, because he was quite literally riding Kuma like a horse. He's linked these characters already in some capacity.
But yeah "Oda is focusing on the Elders and Garling right now"
is a way better argument...... We're in endgame right now. Of course the Elders and the Holy knights are going to get focus. That doesn't mean all other Celestial Dragons who aren't the Elders or the Holy Knights will become irrelevant.