Not sure how this exonerates Greenbull at all?
The dude went to Wano to attack the SHs and everyone else involved with overthrowing Kaido, and then got scared off by a Yonko crew miles away.
The Rocks pirates were at God Valley to either save Shakky or collect treasure/DFs, and even here they got distracted because a bunch turned traitor and started fighting amongst themselves, so when Garp shows up to attack them they just ignore him to get back to what they were there to do.