A tailed beast is not ultimate power, unless you add the crap that comes with it. Such as complete control, ect. other than that it means that you have an OC with a load of chakra. It's obvious in the anime that the Jinchuuriki are indeed not "ultimate" power, and they are incomplete. Just as the Jubi just recently sprung from the hills fully reformed by two beast balls giving it energy, good going Kishimoto on bad writing.
Beside that point, I know it's you're opinion, but saying things like Mary Sue and "ultimate power" seems to not make me upset at all, but put me off on the point you are trying to make. In other words, I'm confused.
Btw, Next Gen means I can get away with a tailed beast. Unless Naruto ends up immortalized, she's staying Isobu's fictional host.
Listen, I wasn't trying to start a fight or anything, just placing my input on your oc, also a Sharingan kinda is since almost all uchiha are dead right? Parden me for not know everything about naruto since I stopped watching it after about 50-100 episodes into shippuden, also I know what a "next generation" is, but are the tailed beast going to be around forever? /shrug whatever I guess I'm just going on about things I'm not 100% up-to-date with