Which synergy-scenario frameworks do senior bankers use in pitches: base / upside / downside splits?

A standard framework has downside, base, and upside cases. Downside includes only highly visible cost savings. Base includes actionable cost synergies and conservative revenue synergies. Upside includes full procurement, footprint, SG&A, and selected revenue upside. Show phasing, cost-to-achieve, confidence level, and EPS / ROIC impact for each case.