2-part question: was Sasori's downfall his puppet body, and...

[Zexion~]

Sasori died because in the end he let himself be killed. He probably did this because, as an artist, he saw the opportunity to die in the embrace of his parents/puppets as the best end his life could have.

Him surviving the team he faced (a prodigy of medical ninjutsu who made an antidote for his special poison + his own grandma and mentor who knew his ability better than anyone else) speaks of how powerful he was.

That said, ninja who can positively take down Sasori are (I'm also sticking to the databook):

1. Nagato/Pain
2. Itachi
3. Tobi
4. Jiraiya
5. Tsunade
6. Orochimaru
7. Madara
8. Hashirama
9. Naruto
10. Sasuke

I'd add to that list (sage) Kabuto and Kakashi, even if Kakashi and Sasori share the same power level (34.5). I'm fairly certain Hiruzen cannot beat Sasori (34.5 > 34) but on the other side I'd bet both Minato and Tobirama would give Sasori a bad time.

according to the data book tobi has an 18.5 -_- and nagato doesnt have an entry... and naruto and sasuke are below him as well.. so thats not according to the data book although they all obv could beat him ... Deidara,kakuzu,kisame would also be able to beat him never mind danzo,minato ( debatable) others

 

[Zexion~]

PnJ. Kishi screwed Sasori. Sasori <3 his granny.

Every akatsuki member was troleld by Pnj ... Except maybe hidan

 

[Curteth]

I think his downfall was Kishi smoking too much pot during those chapters.

Had no idea he was a pot user... O.O guess ya gotta be too be so elaborate though...."

 

[flints]

sasori died because he was too overconfident and also he underestimated his opponents