Tell me how this makes sense - Momo said he was staying behind at Zou when Luffy left for WCI to learn more about VOAT and how to communicate through it; he was able to pick up pretty quick that he was vibing with Zunisha, an animal to whom he had never previously spoken; now, even giving him the benefit of the doubt with how much it hurt, you’re telling me Momo had NO idea what has happening to him when the exact same thing had happened just weeks before? He didn’t say “Ow, it hurts,” he said “What is that? Who is it?” as if this was his first time experiencing the sensation. On top of that, to not recognize a voice he should be more than intimately familiar with by now is just dumb writing, there’s no argument otherwise.
As I said everytime we see the VOAT in action seems to hurt any human that involves it, Momo suddenly hears something is head which probably was out loud he put his arms in his head in pain and asked who it was because HE NEVER communicated with Luffy using it why the hell would Momo hear a voice in his head asking for something and immediately link it to another person whom again he has never communicated with using VOAT?
That's only you assuming just because Momo got used to talk to Zunisha he now is the master of VOAT and recognize voices to whom which he has never talked before using it.
This more of a dumb assumption from your side than dumb writing for something tjat got clarified in the spam of a Chapter.