This scene shows how McKinsey partners conduct cases using an economics language. Kevin guides Alice to the baby testing, but Alice needs to outline the economic barrier.
Kevin is hinting that this a “product” comparison issue. Alice needs to analyze the products and identify the one area where the baby cells will have a major advantage.
Alice makes a classic mistake of forgetting the cells are a product with a market and, therefore, ends up analyzing the cells solely around scientific dimensions.
Kevin helps Alice by explaining the key difference between the cells, and it is a strong hint to Alice about the possible economic advantage generated from the baby cells.