Solve the question in hand on one slide. Amend only what you ask to change. Lock it. Then build.
ASK → ONE SLIDE → AMEND → LOCK → NEXT SLIDE → BUILD DECK
A locked slide is immutable until you explicitly unlock it. “Change the headline” changes the headline — it does not redesign the slide or rewrite the deck.
One question. One slide.
Ask Nige should use the controlled Milford answer, current numbers and approved visual sources to make the point clearly. This surface is the editorial control layer for that workflow.