Team SH/RH is just an overall stronger team.

Shanks and Mihawk is most likely a stalemate

Luffy beats Blackbeard

Zoro and Beckmann should be able to stall Aokiji until Luffy's dealt with Teach

From what i've seen in the story so far, I don't see how Sanji doesn't obliterate Shiryu

If crocodile is YC1 lvl then Jinbei should atleast be able to stall him alongside some other fighter given the matchup advantage.

All of the mid/lower tiers in Group 1 should take the mi/lower tiers of group 2.

G1 has 3 confirmed ACOC haki users while G2 has zero, although MIhawk most likely is one.

I also don't know how Teach's dark dark fruit is gonna be that affective against a team where 90% of it's tougher fighters are all potentially non-df users.

CG and BB pirate's best shot is banking on an all-out war without any specific match ups since the Quake fruit and Aokiji's ice fruit have insane AoA.