Always, i believe you are missing the crux of my frustration.
2794 + 825 will never equal 2758
or more extremes
2000+ passengers plus 3000+ passengers will never equal just above 2000 passengers
You have too much time on your hands.
The reason why there's 3500 pax per day is because the price is under default price. If you halve a ticket fare, you'll end up taking in many more passengers than you would at full fare (See: any budget airline ever). Now go and just enjoy the game, rather than trying to crush someone else's routes.
Well, some his PAX are in the C class which will stay constant regardless as to how many flights you add seeing as you operate solely in a Y configuration. The rest I'd say are his connecting passengersdue due to hubs / alliance which you also don't really have access to once you've conquered the all the O&D passenger market.
Connecting passengers are not counted in the % figure, just O&D.