It doesnt have to be an epilouge event, but it has to be its own event. Making Zoro fight Mihawk WHILE Sanji fighting another commander and Ludffy fighting anothee Yonkou will lessen the hype, since people would just be more invested in the Shanks fight. And beatiing Shanks isnt even Luffy's main goal, just as beating Ben isnt Sanji's main goal. Robin and Luffy's goal work together because one cant know the truth about the world if you cant reach Raftel, and by reaching Raftel means the Captain becomes the PK.
To be fair, a scenario bringing back the Baratie would be awesome.
Mihawk's appearance was during Sanji's introduction arc. There, Sanji and Zoro had very conflicted views due to Sanji being stagnated at the Baratie.
"Just throw your stupid dream away!"
Having a moment where Sanji says something to Zoro like "I'll hold down the fort while you take on Mihawk" would be a really nice throwback and cool interaction between these two, IMO.
I definitely don't see Zoro vs Mihawk on this scenario being the same as Zoro vs "insert commander here". nothing prevents Oda from giving it more chapters than normal, etc.
My problem with how the story is unfolding, is that I'm having a hard time imagining a scenario where Zoro would stop whatever he is doing with the SH's, to go fight Mihawk.
If we have a war like Marineford, Mihawk won't be there as a Shichibukai. If Mihawk joins someone, it makes more sense to be Shanks than anyone else.
In the end, is just a "what if" scenario anyway.
