Everything in the manga implies it. Yama stated he would kill every Quincy himself.- You have no proof Yamamoto defeated Yhwach by himself
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If he needed help or had extra help when he defeated Yhwach 1000 years ago he wouldn't make such a statement and be confident that not only he can defeat Yhwach but his entire Quincy army by himself.
All members of the Royal Guard were captains before.- Ichibē is the man who created the names, Bankai , Shikai, and Zanpakuto , he wasn't even in the gotei 13, also manga says "the power of the zero division is far greater than the gotei 13 "
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The manga says their total power is greater than the Gotei 13, meaning all 5 of them together, not a single one.
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Being a Royal Guard doesn't automatically make you stronger. They're not even recruited based on power, but the significant contributions they've made to the world. Kirio Hikifune was the former captain of the 12th division but got promoted to RG status because of her creation of the artificial soul. That doesn't automatically make her more powerful than the other captains because she was still below Yamamoto when she was a captain in Gotei 13. If Isshin Kurosaki (Ichigos father, former 10th division captain) created something important to the world and got RG status, does that means hes automatically stronger than all other captains? No.
Also, that statement about the RG hype of being stronger than the Gotei 13 was made before the power spike they just got in this final arc so thats totally false now because the same RG that were steamrolled by the Quincy are about to get steamrolled by the captains (Byakuya, Shinji, Kenpachi, Soifon etc.) on their way to fight with their new powers.
No ones taking about Shikai though.Yamamoto's Shikai was ineffective, and he activated Bankai against Royd
Doesn't mean Bankai Yamamoto won't smack Yhwach around.Base Ichibei was smacking YHWACH around before he decided to use Shikai
Except he did take Ichibeis power, its just couldn't become his (Yhwach's) and Ichibei took it back.Yhwach stole Yamamoto's Bankai. Yhwach failed to steal Ichibei's Shikai with sankt altar, you clearly didn't know what I mean
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Except nothing implies Royds Blunt Vene is weaker than Yhwachs. Thats an assumption you made because Yhwach is the strongest Quincy but you have no evidence its true because their powers can vary. If I said Yamamoto has the fastest Zanpakto just because hes the strongest captain it would be wrong because Gin's is the fastest.Royd's Blut vene was capable of saving him from the ZnT heat
Ichibei destroyed yhwach's Blut vene anhaban with one hand , implying that his durability is > Sternritter Y Durability and thus he can survive the heat
Assuming Yamamotos flames won't counter this effect.Ichimonji can Manipulate the black in different dimensions , times, whether you are dead or alive , shinigami or quincy , clothes , animals, it would control the black on you and seal you away and erase your name , like what happened with yhwach .
Doesn't mean hes the strongest now does it? Also, Yamas hype is greater than Ichibeis and I disagree, Yama wouldn't lose.ichibei is the last wall before the soul king himself , yhwach himself admit that he is the head of the shinigami Yamamoto would lose against him , by feats and hype