I half wonder if once upon a time (like pre-June 2019) they were considering a narrow body HKG-MNL flight (or even a GUM-MNL-HKG-MNL-GUM flight). I've routed through HKG a number of times and jumped from UA to CX for the leg to MNL. I know they've been getting away from the Asia tag-on flights, but this might have worked had it come together before the current reductions at HKG.