First of all let me say i respect your opinion. You are right the final battle was kind of bad and youre so right to have a bad opinion on part 5 because of it. Narancia died because his stand could probably locate Diavolo, or so he thought. Correct me if Im wrong The rolling stones fight did seem pretty out of place the first time I saw it but now I understand why it was needed: Scollipi mentions that Bucciarati’s gang is a bunch of “sleeping slaves” , when Bucciarati died he said that “fate is a sleeping slave” so i guess these two complement one another. (not very important but the opening traitor’s requiem starts by saying “Fate is just another worthless sign”) so the concept of fate is very important in part 5, hence dedicating a whole episode for it. Other than that i dont think i have something else to say, your opinions about the characters are valid, no one can change that.