Yeah the Akainu/Kizaru part better be fake if it has to have a fake part
No reason makes sense to not go save the guy that's huge asset to marined after they lost warlord system.
"Wait Borsalino, let CP0 kill Vegapunk first"
"Wait Borsalino, let Dragon's son kidnap Vegapunk first"
Unless his reason being "Wait Borsalino, let's repay them back for turning their back against us and let them know how much they need us"