Quote Originally Posted by DarthEnder
The reason you missed it is because Arch made half of that stuff he said up.

The ONLY thing that Jirayia said was "Don't use "that technique"" without ever explaining what he was talking about.

Its pretty obvious after watching the rest of that arc that he meant the Demon Fox Cloak. Especially since he gives Kakashi a counter for it and is all "if a second tail grows, use this"

Since the Oodoma Rasengan doesn't do anything but make Naruto a little tired theres nothing that even suggests it uses Kyuubi chakra. Its not red, its not even purple. Its exactly what it sounds like. Just a bigger Rasengan.
I decided not to pry anymore, since I thought I've seen Archie's name in the manga threads a couple of times.