You understand we have the post time-skip Heart pirates, which means Law as well. So Law with sanji takes down doflamingo.
Hancock is a fodder killing machine (Perhaps some vice admirals as well) with her powers. (Since she is with the strawhats now)
Moria is useless since we have fishman as well.
Ivankov and Cavendish (Hakuba) take down kuma
And Vista+ Jozu can entertain mihawk for a while
Iron Pirate franky shogun takes care of pacifista
Which leaves 3 Admirals + Vice-admirals + Garp +Sengoku
So to fight them we have,
Luffy + Marco + Jinbei + The toy soldier + Bartolomeo + Zoro + Chinjao + Elezabelo.
+
Red Hair pirates
So basically from scenario 2 everything changes.
Two admirals going out were able to change the landscape and send an island in chaos just by their crossfire, aokiji was able to freeze tow mountain sized tsunami in a matter of seconds and many other things, most of the people u listed would die in crossfire or something, so u actually think luffy,marco,jinbei,toy soldiers, bartolomeo, zoro elizabello chinjao or even all the colosseum fighters are supossed to match the 3 admirals? nice fanfic.
We had a shitton of high tiers on the m3 level and below during MF, no one of them had the guts to even think of challenging the admirals, as @Love Cook said there were all these veteran NW captains:
Doma, McGuy, Decalvan Brothers,Maelstrom Spider Pirates, Little Oars Jr, Whitey Bay, Elmy, Ramba, A.O, Delacuajl, Epoida, Bizarre, Islewan, Karma, Blondie, Amadob, Palms. Andre. Zodia, Hangan, Rush, Wallem, Brocca, Choi, Ninth, Agsilly, Julius, Kinga, Arthur, Pavlik, Great Michael, Baggaley, Brew, Zucca, Kechatch, Cands, Vitan, Reforte, Happygun, Sleepy, Colscon, Forliewbs and Nosgarl.
And the only thing they were able to match were the VA's, leave out marco and I can see Aokiji blitzing all colosseum fighters and other fighters really, u people tend to understimate the marineford, they took down the strongest crew in the world without big casualities except normal soldiers, not to forget that in the fight against luffys group and others there are like 100k elite marines and i dont think that was all the navy arsenal, I can see marines having way more soldiers than 100k, even adding shanks it would add some high tiers and most likely 2 top tiers, nothing else the only time I can see the marines not having the upper hand is adding the revolutionary army.