the context was different duh.... on Germa's case is BM herself that want to slaughter them from the first place and take their technology.
Zepo and Pedro was pure accident and BM litteraly amaze with Pedro's determination to live (also with little help from Pekomz) so she let him live
It's well within Judge's capabilities to sweeten the pot and throw in the Germa tech on top of it.
But at the very end of WCI, Big Mom asked one simple question, while singing a song about "Soul Pocus", before WCI ended for good....
That my friend, is what we call context.....
I've been saying this was how Germa and the Sun Pirates were going to escape WCI, ever since that chapter hit, because of this exact scene.
The fact that Jinbei showed up on Wano, perfectly fine with no type of injuries strengthened my suspicion, and now that we see Germa sailing away from WCI, perfectly fine, with not a single BM ship in pursuit of them, pretty much solidifies it.