I see it like this

Zoro vs GB due to him being actual swordsman and now evidence suggesting him having BB.
Sanji vs kiz


And, luffy vs Akainu - Akainu is too big of a fish to fall to that cheap copy version of Ace.

Fujitora won't fight with SHs.
LOL
You forgot Aramaki isn't a swordsman
He just achieved the black blade as a side quest (or some bull shit like that).
 
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