Under the given conditions, Sosuke Aizen could defeat Zaraki Kenpachi in battle.

:) Thank you for the challenge, GeorgeCarlinWorshipper, fun we shall have. Aizen's total stats do exceed Zaraki, but he is still at the limit of a Shinigami, and physically by those numbers the two are of equal brute strength against each other still since they both pretty much tip the limit on offense and physical strength. Zaraki would thus have the superior physical strength while Aizen has superior kido, defense, and speed. They are still tied for Offense in general. Also, Aizen's Hogyoku only allowed him the boosting of his abilities with transformations, and before his transformations the Hogyoku only served to continuously regenerate Aizen's body. Proof to this is how it was noted that Aizen was getting tired even after he was fused with the Hogyoku (1). Aizen did not begin surpassing the limits of a Shinigami until the Hogyoku started to reconstruct Aizen's soul, so until that event Aizen is still under the limit of a Shinigami. Zaraki is also not void of thinking. He is insane with little caution, but he never fights without making sure his abilities matched those of his opponent. Zaraki intentionally has his energy sucking eye patch (3) just so he could fight weaker opponents than him while still enjoying the feeling of a full on battle. As demonstrated in chapter 312 (2), he was easily able to defeat the fifth Espada with little effort once he grabbed his sword with both hands. His regular fighting style, which includes only using his sword with a single hand and making his movements obvious with the bells in his hair, was deemed by him to be unable to defeat the Espada, so he simply ended the fight with a single downward slash. Like the bio of Zaraki you provided in R1, he doesn't use Kenpo because it is so powerful that his battles end up finishing too early, so he avoids using it unless his life is in danger. Against Aizen, who he knows he can only kill causing massive damage, a Shinigami captain who keeps regenerating every cut he makes, it is more than likely he will use Kenpo, which holds enough power to be considered Zaraki's 'Bankai' in terms of raw power. Also, Zaraki, although it is overlooked, has raw skill in battles, able to adapt to fighting a different way just like how Aizen adapted to the optical illusion Shikai of Shinji. He is insane and he loves fighting with little caution, yet when he was fighting with Tousen's Bankai, where literally every sense (even sensing Reiatsu) except touch was sealed, Zaraki was capable of fighting Tousen only using his sense of touch to feel sword blows and fend Tousen off. When he got bored and found out the weakness of Tousen's bankai, he was able to exploit it and end Tousen's Bankai. His intellect, though mushed with his insanity, still allows Zaraki to fight with great adaptation. Even before his eye patch was taken off by the Fifth Espada in the mentioned fight, he was able to get used to the strength of Nnoitra's Hierro. Also, in pages 13-16 of chapter 313 (4), although Zaraki never got healed after his battle with the fifth Espada (although he could have been healed off screen), when he faced the 0th Espada Yammy (5, 7), who took a head-on Getsuga Tenshou from a masked form Ichigo with only a 'nick' (6), Zaraki easily defeated him. Byakuya was present, but did not really aid in the fighting when Yammy was defeated the first time around. When Yammy evolved to his 'ultimate form' later, he was still easily defeated by Zaraki and Byakuya, with Zaraki noting that the battle was 'boring'. All of Zaraki's fights, which amount to more victories than losses, were up against opponents who had more skill diversity. All Zaraki usually uses is powerful slashes and rushes with immense brute strength, yet he managed to overcome all those opponents with so many fighting options. Zaraki has done so in many of these fights with adaptation, using his massive endurance to his advantage, and learning weaknesses or otherwise pulling out unbelievable power. Also, a similarity in Zaraki's fights can be seen by the audience. Zaraki always seems to have some disadvantage, or is otherwise cut many times just to get a few hits in. This is because getting cut and his in a fight is what Zaraki enjoys the most, so he is reckless because he wants to be, because he wants his opponents to be a challenge to him. That is the whole reason for the eye patch to be made for him. In Zaraki's fights with opponents of various levels, from pre-Bankai Ichigo to 0th Espada, he always matches the level of his opponent because he wants to. He could very well do the same with Aizen. In conclusion, Aizen's total stats exceed Zaraki, but it is still within the domain of Zaraki's power without transformations. Zaraki's kenpo requires little effort from Zaraki himself, but is able to split an Espada in half, basically having Bankai level force without needing Bankai itself. Zaraki also has a decent presence of mind and capability to adapt to a disadvantaged situation that comes almost natural even with his insanity. Zaraki's challenging opponent was only challenging because Zaraki wanted a good fight like he always does, and in reality Zaraki's power easily eclipsed the so called challenging opponent with little effort needed, just as Aizen's power eclipsed the other Espada. Zaraki, with his limited amount of skill diversity, has still won fights against opponents with vast skill diversity. Zaraki, though he may land a few of his first hits on Aizen only to stand back for Aizen to regenerate, would not do that for long with how he has fought his battles, and will likely find the weakness to any barrier Aizen sets up and crush it. 1. . http://i7.mangareader.net... 2. . http://www.mangareader.net... 3. . http://i13.mangareader.net... 4. . http://www.mangareader.net... 5. . http://i28.mangareader.net... 6. . http://i30.mangareader.net... 7. . http://i28.mangareader.net...