THIS.
Did the sort end on time as planned by DRA? If no, then the CRR should have alerted MGMT before leaving the building there may be a problem getting all P1 off. Did the CRR make his leave leave building/fine sort time? If no, then he has a problem.
And of course the CRR should have alerted that he would have 13 lates. Each station has some cutoff to ask for help. Ask and the onus is on MGMT to make the call. Don't ask for help or don't communicate you will have lates and there is little anyone can do to cover the CRR.