User blog comment:Salubri/Aizen, Yamamoto and Wonderweiss/@comment-44061-20100226183601

Im going by what Aizen said himself. That in a one on one battle Yamamoto would more then likely defeat him, as Aizen just doesn't possess the attack power on his level. Aizen was so concerned about this he created an specifically modified arrancar with the sole purpose to stop Yama's zanpakuto. If there is somewhere where he says brute strength then i will concede my point. If he specifically states that everything you have said then point to it, otherwise thats an biased interpretation of the situation and not a factual one. Aizen himself has even mentioned that battles between Shinigami are battles of Reiatsu. He admits that in this battle he wouldn't win, hence wonderweiss. Seeing as Zanpakuto are powered by reiatsu as well as kido, and shunpo we are in fact talking about Reiatsu level/strength. Not to mention its quite unlikely anyone would dispute Yama's skill in swordsmanship or any other of the shinigami skills. Your stating a point of view as you mentioned. The facts are simply printed for all to see and say otherwise. Regardless of what Yama planned to do (without using bankai might i add), Aizen was threatened enough by him in general well before entering FKT that he had to create an arrancar specifically to counter him. I dont know what more do you need when he mentions that the main expression of Yama's power is in fact the strongest of zanpakuto, he even mentions him at being the strongest in the situation.