I think we wont get any fights shown through flashbacks especially from characters who we have seen fight in present.
So, it is better not to expect any. We didnt fully see how Oden fights but we saw all from WB and I bet Oda isnt thrilled to draw same thing twice.
However, Oden vs Roger is something that may or may not get more details because we havent seen how those two fight. Knowing Oda, it will be off-paneled too since it just isnt important for him as much as it is to us Versus junkies.
Regarding the chapter, we are seeing Oden literally do the same things Zoro did in Wano.
Hiyori as Zoro's waifu confirmed which gives wind to my Shogun Zoro theory.