I read #6 and #7 back to back last night and had a blast!
(Torpedo, I looked for the answer to your trivia question, but couldn't find it - I guess I just don't know song titles good enough)
In #6 and #7 Hama definitely wrote the script itself with all the dialogue. All the Joe interaction and the stuff with the CIA guy is classic, classic Hama.
You can say what the plot of the story is in a few sentences: The Joes must protect a captured Russian plane from being reclaimed by the Russians and from being taken by Cobra. Elite Russian team, the Oktober Guard, attack the Joes. While the two forces are fighting one another, Cobra shows up and takes the plane to a heavily fortified bunker. The Joes and the Oktober Guard team up to get the plane back from Cobra. In the end the Joes succeed in taking the plane away from both Cobra and the Oktober Guard, but then they find out that they were just a red herring the entire time.
It's my guess that Trimpe did little more than come up with what's in the above paragraph and then Hama took that and churned out #6 and #7, writing the script, all the dialogue, deciding which Joes would be featured, etc. In my mind that's the difference between plot and script.
In #6 I absolutely love all of the Joe interaction as well as the plot, itself, with all the international intrigue going on. The continuing Clutch/Scarlett conflict is great! Steeler, Clutch and Breaker had just been featured big in #5 and all three are back for #6 and #7 - nice to have that continuity, and of course readers should feel pretty familiar with Stalker and Scarlett by now as well. Great to have Flash along too as I don't think we'll see much of him after '82. The personalities of Stalker, Scarlett and Clutch overpower the other three in this adventure, I'd say.
I love the Oktober Guard (I have all 5 of their figures from the comic three-packs released, I don't know, 7 or 8 years ago - awesome figures, though I'm still hoping that Hasbro will release them as 25th anniversary style figures as well sometime.
My only complaint with #6 is that when the OG are pinned down, under fire from the ATV they leave their cover and charge out and begin fist-fighting with the Joes - that moment always seemed a little much, even when reading this as a kid - I remember thinking - what the the Joes can't shoot them when they're running up the hill like that? But oh well, this kind of thing happens in comics a lot, and it certainly didn't stop me from enjoying the adventure.
It's funny - in my Tales of GI Joe #6 they reprinted the pages in such a way that the two-page spread are on different page spreads! So I didn't even know that this was meant to be one big picture until Marvel published the #1-10 trade around ten years ago! But I agree with Torpedo and Shane that this is a great spread.
I do remember noting as a kid that this was the first Joe issue to end on a cliffhanger. And it's a great cliffhanger at that with CC himself coming onto the scene!
#7 starts out very cool with their escape and teaming up with the OG. But though I remember loving all the booby traps in the fortress as a kid, the action here for me doesn't really stand the test of time.
Still, this is a great story that's pretty complex for a kiddie comic with the Joes being a red herring.