I guess the question is whether boss is friends with the person with whom the resigning worker was always having conflicts and might have been helping them to drive the resigning worker out. If so then normally things shouldn't be this bad...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8