I kinda pity Gin. It's like everyone's forgotten about him. Why don't they level the field by taking out Gin first? Now Gin's probably so annoyed he'll go around stabbing most of Ichigo's guard with his shikai - long distance. What's the point of having a guard? They won't even be able to see Aizen if doesn't want them to. The most Ichigo could do is point them out and tell them where to guard. Kubo strategically killed of Tousen, the only one whose Bankai could actually help Ichigo. Just activate Bankai, give Ichigo the sword and let him handle it. Better yet, fight along with him.
Yamamoto really is quite lazy. He knows he's the only one with probably enough raw power to match Aizen, yet he's doing nothing. He's not even defending Ichigo. Maybe next chapter he'll blind Aizen with flames or something but who knows. It appears he prefers showing off and picking off small fry like Fracciones.
Plus, the chapter really zoomed by. Kubo is highly gifted if only for the fact that he can make a 19-page chapter with 5-page content that feels like just 10 pages when reading. Heck, Naruto has two pages less in a chapter but so much more happens. Ichigo did what - swing his sword a few times, stopping halfway half the time, put on his mask for 2 pages and then just gaped there listening to Aizen. Wow.