I mean these are the current members of Cross Guild
https://www.sportskeeda.com/anime/one-piece-1082-all-known-members-cross-guild-ranked
Now assuming they they have to fight another Yonko crew, let's say the Beasts Pirates
Mihawk vs Kaido
...
... then what?
Crocodile vs King?
Daz vs Queen?
Buggy vs Jack?
Galdino vs Apoo?
Albida vs Hawkins?
Cabaji vs Drake?
Moji e Ritchie vs Sasaki?
And so on
Come on lol
They would get slaughtered
Hell King would solo all of them with ease
Remove Crocodile, and even Queen would solo
With Cross Guild members being easily beaten, the commanders would go assist the Yonko against Mihawk
Mihawk alone is so strong that he makes Cross Guild a Yonko-level threat, evidenced by him being the only "subordinate" with a higher bounty than his captain, as well as Buggy's sudden confidence to compete for the Pirate King etc
But Mihawk can't carry alone
He can definitely solo a Yonko
Even haters know that in the very least he is Yonko level and he can fight one on equal ground, regardless of the outcome
But the rest would have to hold off the crew...
And they stand no chance to do that
But with
It would be a different thing...
And it would create the Seven Warlords Crew that everyone always speculated of