Give the recommendation if the evidence supports a direction, but make the unresolved item explicit instead of hiding it.

A strong synthesis separates what you know, what that implies, and what could still change the decision. That shows calibrated confidence rather than hesitation.

State the recommendation first, support it with two or three decisive facts, then name the remaining risk and why it matters.

Finish with a concrete next step to resolve that uncertainty, such as a pilot, customer test, sensitivity analysis, or diligence on implementation cost.

This came up for me recently. I found it useful to summarize the new information in one sentence before moving on.