Lets think about this for a second. It took Rasurriken to take down human realm, took a punch to take down asura realm (baldie), and took double rasengan for anima realm.
I think Asura realm is one of the weakest bodies of Pein, I thinka Anima realm is second weakest, and human realm is pretty damn strong, he's just slow. Could Rashurriken have taken out al 5? Sure, if they were as slow as Human Realm.
Here's the thing, in every manga I have read, the further up the food chain you go, the stronger your opponent, the stronger the jutsu you need. Pain is obviously being tactical about this, saving his meat until after his potatoes have been eaten.
I honestly don't think a single rasengan can take down any pain save for Asura and Anima. And honestly, that panel looked like the two Peins were grabbing his arms to me. Im on my phone, maybe I can't see for sure. That's the way it looked.
You see a vase, I see two faces.