Plus them being seraphim means even tho they’re kids they way less likely to be in danger. Like luffy would never let normal kids join but they’re at from normal
Yeah that's absolutely true, excellent point too. Plus from a moral perspective, they would be safe with someone as innocent and pure as luffy and motherly as Nami and Robin.
Other people would try to exploit their strength, innocence and forced obedience somehow. They would be treated as weapons and maybe slaves too depending.
They're best off with Luffy or as Bonneys new crew.
God help anyone taking them on especially if Bonney or somehow Shinobu ages them up too lol.