Base on dialogue some said it's children not a child
I'm not japanese expert
And yes we only see BB with mom at the end
True but i dont see the point oda hiding his other child
took his wife and children to god valley and we only see the baby momma / BB but he said children so must be more one

kinda hate when oda teases us
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BB isn't the final villain
he is just another broken soul and luffy will fix him
imu is 100% the final villain