Not knowing the action that has caused this final decision to be made, we can only caution you that the MOL may take the space between incidents into account. If the first incident took place 4 years ago and there was a gap of 3.8 years between incident 2 and 3, this might not be viewed as sequential. Ultimately, if the event is egregious enough, you do not need to follow a 3 warnings progressive discipline, there is no legal requirement, but tenure and spacing may be sticking points that you need to contemplate.