I do remember that after this weekend they drop the previous WTF points from all so as you say it is a simple matter then of just adding whatever is gained at the O2. Any of the four at present behind Andy could go past him IF they win in London. Some could by getting to the final or the semis. Only Stan W would not add enough points if he won to leapfrog Andy. That is the only certainty. Those of us wishing Andy to maintain as high a ranking position as possible need to be wishing for a Novak v Rafa final as not only do they mop up the big points but the others will then be picking up less in round robin wins?
Surely only Ferrer and Delpo (and Fed if he wins everything) can overtake? Unless I'm missing something!
Andy is on 5790
Ferrer 5560 (more if he beats Rafa today!)
Fed 3805, 4445 if he wins Paris.
WTF maximum points is 1500 - would take Berdy to 5480.
WTF points are 1500 for undefeated Champion (200 for each round robin match win, plus 400 for a semi-final win, plus 500 for the final win).
Even if Fed won both tournaments, but lost one of his RR matches he wouldn't overtake
Even with three RR wins (600 points), Delpo would still have to win the SF to overtake .... I think!