Revenge was a dish best served cold. Or at least that's what Jack kept telling himself when they exited the conference room that the Primal had brought them to.
One reason he kept doing that was to put himself in the exact kind of mindset one would have expected from him after Grimshaw got off without even so much as a slap on the wrist for all he did.
The second reason was to remind himself that, one day, when he was strong enough, it would not be too late to address this grievance. Letting go of grudges was something neither Lex nor Jack were good at.
At least Grimshaw ended up paying a significant amount - the Crystal alligator would be the one who would enjoy those benefits. As it should be.