What exactly is ironic here? Anyway, its true that some effort is being made to stop the crew, but it just doesn't feel like substantial pressure is being put on the protagonists, in terms of execution.
Jinbe and Pedro can apparently instantly leave their encounters with no consequence. Capone can casually spend his time freeing Luffy and announcing his betrayal, despite Katakuri being a few metres away. Even Sanji, who is still fighting, is not dogpiled but rather engaged in a 1 on 1 fight, as Big Moms pirates appear to follow Assasins Creed encounter rules. What, are everyone else, from Mont D'or to Smoothie engaged with capturing confirmed Luffy-decoys offscreen?
All in all, despite being severely outnumbered by the top brass of a top tier pirate crew in a very compact area with minimal distractions (like I said earlier, the fake Luffys already feel pointless), the protagonists have altogether too much breathing room and freedom, which undermines the tension and the credibility of their opponents.
The fake luffy's were suppose to be a decoy for a bit but Luffy ruined that plan. Katkuri attacked the real luffy, Big Mom yelled at him about that. Then the whole thing with Jinbe happened. Big Mom was directly attacking luffy and Jimbe this chapter. Then it became a free for all, with Jimbe getting jumped by 3 people. Sanji getting attack by genie in a belt and pudding. Luffy was tackled and held by Capone. The vinsmokes are surrounded with guns to their heads. It is not like they(big mom pirates) are not doing anything. They But yeah, Jinbe and Pedro retreat does seem a little odd. Mont d'or was with pudding. They have not shown Smoothie.
I am not sure if they are out numbered by the "top brass". We have Katkuri, Smoothie, Big Mom, Genie belt and Oven. Candy man, the oldest son is dealing with the vinsmokes. Those are only the top brass they I see are there, I could be wrong tho.