You're right, you can't fully de-risk this, but a few things help meaningfully. Pre-close, the most useful signal is tenure data combined with role concentration. If one person has been there 8+ years and is the sole point of contact for your largest customer relationship, that's quantifiable risk you can price into the deal or structure around, even without talking to them. A 90-day seller-involved transition where the outgoing owner explicitly vouches for the new buyer, paired with retention bonuses for the 2-3 people whose departure would actually hurt could help. I would also run a diagnostic: map every customer relationship and every undocumented process to a specific person before you close. That map tells you exactly who you can't afford to lose and how much it would cost you if you did. We built something that can help with this, DM me if needed.

I literally wrote a book on all of the framework that you need redacted