I'll have a look at the spreadsheet later. Out at the moment so this is off the top of my head without checking my facts - which is not an approach I like to take....
He has the highest proportion of the WP list recorded of any of the regions that he has finished birding with close to the least proportion of his time spent there so if you are looking at a gap analysis to work out where he could have spent his time more efficiently, it is not where I would start.
Birding without borders.... Global birding community. Raising awareness. Engagement of locals and raising awareness of local initiatives etc.
Mind you if we find out say he's diverted via Bali to build his list en route to PNG, it may be his inner competitor coming out. B
All the best