We are usually in agreement so I am a bit surprised at this, but everything you said here just confirms what I said, that there was no story. A survey of all the characters that ever appeared in the Fantastic Four Universe doesn't constitute a story. What do you surmise is the plot points here? The Yancy Street boys stole the FF gun and fired it off is a plot... not much of one ... not related to the return of the FF... but it is a plot.
This was like buying a ticket to a Broadway show. Getting your seat with the help of the usher, and your playbill. Then the lights go down. A hush comes over the audience and the Orchestra plays the opening music. All the players but two of the leading character come onto the stage and take a tremendous bow. They then shake each others hands. The audience explodes in applause and cheers. And then the cast leave the stage and the house lights go on...
end of play...
BTW - I somehow missed how Johnny and Ben got off that world they were stuck on while losing there powers and being stalked by the evil spider-man. Somewhere I lost an issue.