In this particular case, yes.
Damarius is a ship captain of great renown, he's the best example of why ships are never going to be obsolete and forgotten. There are things that ships are simply inherently better at than mecha. And Damarius is uniquely qualified to extol their virtues.
Ammy is a war vet. She can probably tell more tales of war and what makes a difference in said war than anybody else.
Kath is literally going to be the girl that tears that fleet to shreds in the future, and yet here she is trying to convince them not to fight in that way to spare them the pain of defeat in the first place.
Nei was engineered as a weapon of war that grew above and beyond her original purpose. As she is now, she has earned more love from protecting the people around her than serving her original purpose, so she's proof that the meaning of one's life needs not be the one other people had assigned to them.
And Hugo is smart enough to put all these people together and find a purpose for those ship-girls that will make their lives full of joy.
Just in case, I'm gonna look up some arcane spells that allow for boosting Perform and Charisma so we can SONG OF LOVE our way to victory.