0:00 - 0:25: Miki Komuro
0:26 - 0:34: Hiroyuki Horiuchi
0:35 - END: Miki Komuro

Horiuchi was asked, though his memory was quite vague. Meanwhile recently, Komuro privately gave exact timestamps for the part she was in charge of, making it possible to assign Horiuchi's part by elimination.
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Hiroyuki Yamashita's storyboard has 4 BANK cuts between the overlap at 0:33

c235: "Jiraiya. An important place. If possible, new sakuga only"
c236: "Iruka and Naruto, popsicle scene on the bench. I would like to use Matsumoto-san's rough drawing if I get permission"
(note: He is more than likely referring to Kengo Matsumoto, who is credited on #153 - the episode where the popsicle scene takes place.)
c237: "Neji's end"
c238: "Obito's end"

In the end, he must have scrapped this idea as we can see from the final version

effects at 1:11 of Kyuubi charging up attack same as post #196830, either reused from huang or effects layer prepared by HiroYama