The thing is it is really none of your's, mine, or anybody else's business why Johnny Joe isn't there anymore. Would you want your manager telling everybody confidential info about you? Managers and companies get sued for giving out that info. So even if you don't care about your info, it can end up costing a manager their career and FedEx a lot of money.
This is the same reason why previous employers give out very little info when asked for a reference check or verification of employment.
owever, that it would be nice to know so that you don't make the same mistake. In my experience, just listen at the next few meetings and whatever policy is discussed is most likely the one that signaled the end for Johnny Joe.