How captains helped refine Nelson's attack

Did Nelson's officers agree with his Trafalgar plan, or help modify it?

They discussed it, broadly agreed with the idea, and helped adjust which ships belonged in each column.

Nelson worked through the plan with his captains. Some argued that their ships would perform better in a different column and swapped from the original arrangement. Their ships' individual performance informed those requests. The final order therefore incorporated practical judgments from the officers who would carry it out.