Dragon: Ivan's Island
Luffy: Alabasta, Amazon Lily, Weatheria (Nami), Fishman Island (Jinbe & Shirahoshi), Wanokuni (Kinemon), Torino Kingdom (Chopper), Drum Island (Chopper)...
Shs have so many allies. It's very very bad for WG if they fight
SHs allies cannot compare to the entire army that Whitebeard had of 16 commanders each with 100 or more pirates, since his personal entire crew was 1617 members, then he had 47 allies(followers) each with their own crew and all of them at least at the minimum level of a New World crew.
A Yonkou from Roger's period is always shown to have a massive legion of his own people and SH's currently don't have shit compared to what WB had.
Like how Golden Shiki still had 50+ Ally crews even after losing half his fleet in the Edd War.
I don't know if Crocodile and the WB Commanders and other high level allies would let themselves be commanded by Luffy to war just yet in the story. We're a long way from that.
Drum Kingdom didn't have a legion of serious fighters like WB's New World Captains etc. Everybody in Alabasta is rather weak too.
The entire WG could comfortably handle the SH's allies at the moment. Its Dragon's Rev. Army that are probably superior to SH+Allies and could soon give the Marineford Fleet some problems.
(Assuming like how in the Marineford War, that not all Vice-Admirals arrive to help in the war).