1. Or maybe your assumptions of strength are wrong. Ichigo or the royal guards or maybe Unohana, but they aren't in a position to be CC now are they. Unohana is dead and yama knew Zaraki would kill her so thats why he oredered her not to leave her barracks. Zaraki could be stronger too but that might be the only exception and we have argued this before and I don't want to now, but I still think Kyorakus bankai will trump Shikai/no eyepatch zaraki.Yes to catch them off guard, but in the real fight 1 vs 1, not while your opponent fight two other shinigamis and think you are dead.
Why would he try to do same thing as Kyoraku? Their fighting style is different.. To what you refer when say that? Renji attacking him from behind?
Mask is way more powerful than Starrk. Starrk is not a lot above mid captain level fighters. Kensei and Rose the two captains who are around that level got one shotted by 10% of Mask's Schrift powers. Mask after that had to power up himself and use Vollstanig.
You don't neccessary need to be as strong as Yamamoto to take his place, you need to be near as powerful as him, or to feel the criteria for the position. Hitsugaya successed Isshin, but Hitsugaya is not strong as Isshin. End he had to feel the criteria for that...
On the other hand, CC is leader of the whole organization, he need to be present.
1. It was never implied that Kyoraku is next after Kyoraku. On top of my head I can think of some strongest characters.
2. Because such was never implied. Unohana was implied to be strongest shinigami. Ukitake was said to be equal to Shunsui. I would even argue that Shinji is around there.
3. Yamamoto was never implied to be strongest because he is CC, but because he holds that position for 1000 years.
4. Unlike in Kyoraku's/HItsugaya's case there is no proof that Aizen used KS.
Even if that's true, there is still argument that Shinji was able to scratch Aizen alone, Kyoraku (needed help from Hitsugaya) and Hitsugaya (needed help from Shinji).
My favorites are Urahara, Gin, Shinji and Hitsugaya. Three my favorites character were trolled, still I read manga. I still to see such a person. And as I said if Kubo care about that, he wouldn't made such a shitty sternritters.
5. To which Sternritter you refer? Shinji was defeated by Bambietta. But Shikai Shinji >>>>>> Schrift Bambietta. When Bambietta used Vollstandig (equal to bankai) she beat Shikai Shinji. Shikai Shinji never used Bankai against Bambietta, and used much less power than Bambietta in the fight.
6. Yamamoto who has his bankai for 1000+ years was pretty injured by it. Yamaoto beath Royd with little diff. So I don't see your point here.
7. Than, can I answer your question with another question: "How Kyoraku's beat allow him to maybe beat Aizen".[/B]
Shikai Kyoraku was fodderised by Shikai Aizen.
2. Ukitake is sick most of the time but when he isn't he is equal to Kyoraku. Actually MP t had Ukitake's name on the letter Yama left but for whatever reason Ukitake hasn't been shown to be in that position. Shinji might be close but he wasn't promoted to CC.
3. Manga scans disprove you.
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4. Aizen may as well have said he was using it the entire time. The length of time that passed between their fight and Aizens reveal as Momo was only a few minutes.
5. Shinji was beat by Bazz-B or at least bazz-B was able to get past him and Shinji still hasn't made an appearance since for some reason.
6. Yamamoto was injured by what? His bankai? No Yama was exhausted by it. And also Yama is very old so he was strained by his bankai. Renji was also strained by his so i am saying that Renjis power probably can't last in an extended battle. Remember in SS arc when Ichigo got weaker the longer he had his bankai out when he was fighting Byakuya. Hollow Ichigo said that Ichigos Reiatsu was crushed by the power of his bankai. The point being is that Renjis strength may be used up very quickly.
7. You are the one that said Kubo said Kyoraku might beat Aizen. So how he does it is out of the question so long as he can. With Renji he doesn't have Kubos word behind him so we have to ask how.