Quote Originally Posted by kraco
Was it told why Sasori was a brain in a jar? I seem to recall he preferred it that way, as the final point of a long development process. Though I could be remembering totally incorrectly. But if I'm right, he should be considerably weaker than when we last saw him.
Sasori turned into a heart in a jar because he liked his body remaining beautiful, powerful and ever-lasting. It also allowed him to control more than 10 puppets at a time.

As for whether he is weaker or not... I'm really not sure what to believe in, heh. Did the 1st and 2nd Hokage really die young, or looked like they were in their prime when they died? They sure as hell looked it when they were resurrected. We can also hypothesis that the age of the resurrected person is that of the age of the DNA sample that was taken - if a whole body wasn't needed.

Going back to Sasori, I do think he would be weaker though, in that he won't have all his puppet summon scrolls with him (unless he went back to his secret lab before the war to re-prep), just as Deidara doesn't have his eye-piece and Asuma doesn't have his cigarette.

But then again, Deidara does have his clay, and Asuma his blades.... so maybe this isn't at all coherent and just made up along the way.