I want a badass bottom who seemed to be the top but then the real top matures to be a beef...

I can't recall any manga with the exact specifics you've mentioned but if I had to rec one manga where the bottom looks like a top, I'd rec Yarichin ni Yoru Trauma Kokufuku XXX.

I got you some!

https://www.mangago.zone/read-manga/the_pizza_delivery_man_and_the_gold_palace/

https://www.mangago.zone/read-manga/dawn_of_the_dragon/

https://www.mangago.zone/read-manga/define_the_relationship/

https://www.mangago.zone/read-manga/smyrna_capri/