Good luck for DL getting a HND slot to run HND-MNL or HND-SIN that connects well with their transpacific flights.
I think those intra-Asia routes are toast and folks will connect through ICN on KE. JAL just added a HND-MNL route.
My guess is that it's down to PDX vs HNL for the 4th slot.
I think a 5th freedom ICN-SIN flight could happen if DL wants to stay in SIN.