If it's crap ... We'll tell you
First of all i doubt i found all of the audio, but i think i found just enough for anyone who wants to remix it into a song. Second is... its really not that funny. Because Leon did bring out some good reasons why the Avengers movie won't happen. Which you can read in his blog here. And he didn't say it that often, i guess most of it happen off mic. Lastly, Leon is not the only one that said the Avengers movie won't happen. Co-Host 3000 was loud about it on Let's Do This too. I don't know what episode was it, and i would be crazy to go find it.
So most of it is in LEOG volume one. Just visit Meksicano group, Lost Audio Review and look up the "Tony Stark won't show up in the Incredible Hulk" in Introduction to Beau, "Avengers Movie won't happen" in Introduction to Grant, and talking shit about Joe Johnston is in episode 17.
I didn't go and find where Leon was talking shit about the Thor movie, because back then everyone was talking shit about the Thor movie. Even Cyrus was like "I still think the Avenger Movie going to happen, it just won't be good". If you still want it, just match the LEOG episode date with the date where the Thor movie production pic and trailer first shown.
Good Luck and i'm looking forward hearing the results.