Both good and bad guys, who do you think has caused the most damage to alliance.
Hm, among the bad guys, I think the obvious answer here is King:
1. Held control of BP once Kaido went to the roof.
2. Beat up Marco and ordered for the A9 to be killed, which caused them to disperse.
3. Hard carried Queen by taking care of Cook for the second time.
4. Took care of the Beast Pirates turncoats.
5. Removed Zoro from the live floor.
6. Will potentially wreck the capital if his fight with Zoro spills over there.
Business as usual for a YC1. Katakuri carried his crew in WCI, Marco did too more or less in MF. King is doing his part now.
Among the good guys, there is no one that fits the criteria.