Yes. Give a provisional synthesis based on what you know so far.

The interviewer is often testing whether you can connect the analysis to the client question instead of treating each section as isolated work.

State your current view, the evidence supporting it and what still needs to be tested.

A good consultant updates the working answer as evidence accumulates. You do not need to wait until the final minute to synthesize. For more on synthesizing throughout the interview rather than only at the end, see the complete case interview guide.