In future, whenever you use your valuation model to justify any valuations…do quote its success ratio(as a disclaimer)…how many times it has worked fore you and how many times it hasn’t worked for you… Getting comments removed of someone asking for it doesn’t help any stakeholder… Don’t worry from being shot down - its only the people who challenge you would force you to improve and create a better model - and ultimately that should be your goal - that would be ultimate win.