^^^ 👆
The whole story (concerning MJJ)
revolved around the end of the Omniverse once again, (on panel)
and bios confirm that's the cake JJ was going to eat.
Grant it, plot (Fury) stopped Jaspers once again.
But it seemed he was headed in the same direction.
Although I agree, pertaining to cosmic scale feats,
Claremont didn't have JJ doing to much,
unlike Moore who had JJ becoming the universe.
But that's beside the point when Roma and even narration panels,
clearly stated that the Omniverse was about to get wrecked.
Well, at-least he showed us that JJ can take a ridiculous beating,
even getting his soul blown out of his body (disintegrating his brain)
and still keep laughing, and cracking sarcastic pokes of fun.
That aside, like I said,
I never felt JJ got an upgrade from the amalgamation,
if he did,
he didn't show it.
To me, it's the same 616 JJ as before. (God withIN his warp)
** Edit ** Although again, it's quite possible that JJ had Fury's abilities,
and simply was not given a chance to display them.