Sorry in advance for going on this rant. I don't mean this an attack on you, I've seen your BT suggestions and mostly they seem good, but this one is waaaaay too much. People think Edo Minato is broken now? This would take that to a whole new level. Let me just explain why these BT (and for the most part, any BT on SOSP) are not a good idea.

SOSP had his time as the top meta ninja. His skills are already good even if he's not at the top anymore. Most importantly, he's a one man army, unlike current meta ninjas:

- Edo Minato needs to chase to reset his mystery cooldown and to scale and doesn't regain health like Naruto unless you run the non-cooldown chase and like no one does that. Even if you did it's nothing near SOSP's healing which he c*ways trigger on his own with mystery.

- Kakuzu needs someone to generate chakra for him and someone to keep debuffs off him.

- Rinnesasuke, same deal as Kakuzu. Plus he has no innate healing.

- Ronin Naruto needs debuff reflect and/or clearance.

- Kushina is the closest to SOSP in terms of being a one man army when the only ninja left on the field but she still benefits from having her chase triggered to reduce cooldown faster. She also can't trigger her own chase off her mystery, unlike Naruto who can.

If the changes you propose to SOSP were implemented, he would be broken beyond anything in the game right now. At least with these other meta ninjas, you have to give some thought to the supports you're going to put on the team with them. With these BT, making teams for SOSP would be pretty boring since his kit has basically everything. We'd probably go back to the Naruto/Bee [7 swords]/KK Gaara teams because what does this Naruto need, other than some buffs and extra standards? Both of which are not INTEGRAL to his being good (unlike Minato's chase, keeping debuffs of Kakuzu, etc) but are just a bonus. It's a 4 ninja format after all. Give the supports some reason to be there. Plus, with this idea that he gets a buff from pretty much ANY barrier, it just makes it all that much easier to just slap a random barrier ninja on the team without any real thought.

The only thing current SOSP lacks in comparison with the current meta is scaling. And here you give him TWO possible methods to scale? I don't think any other ninja has that. If SOSP ever does get BT (which I hope he doesn't because he was annoying enough before), scaling is literally all they need to add, not any of this extra stuff. You want him to scale off his chase, which immediately follows his mystery (not the case for any other meta ninjas). In addition to scaling off his standard? That's basically guaranteed scaling in a way no other ninja has except maybe Kushina.

One thing I do like from your ideas is the bond skill. I think that if he got only the bond skill and no BT, that would be fair. Bond skills are underutilized in this game and I wish there were more of them.