the ra couldn't even keep kuma safe, also dragon was fine with leaving ivan in prison till he got his (big army.........) which means years from now if luffy never showed up..
it only been like around 5 -6 years since she died, also ginny and kuma lived in that church for years, i assume ginny at least would found and ate it but never did. bonney never leaves the church, so df must spawned after ginny death. or it would been found by ginny years ago imo..
imo he better off with luffy, dragon didn't even help kuma with sorbet king, kuma did all by himself. dragon never showed up for anyone from what am seeing
instead it kuma showing up to help in dragon war in past. and now this. even without haki kuma a one man army by himself even before meeting vega punk.