It does. If Andy earns 2000 out of the possible 4500 points possible (for the 5 tournaments he plans to enter) by year end, he will be around 9000 points. If Andy wins the AO, he will gain 1280 to get to ~10000 points. With one or two MS wins (1000 each) Andy will be around between 11,000 to 12,000 points and should achieve the #1 ranking by end March.
This won't be easy. Maybe Andy needs a few good results at the clay court Master Series (Apr to May) to make it to the top.
There is another unthinkable / highly improbable scenario. If Andy wins all 5 tournaments, Andy can get to 11,200 by year end and could achieve the #1 ranking if other results go his way.
Thanks for that Philip. It's worth having some idea of what Andy needs to do to get to number one. I have a feeling Andy's clay season will be better next year, if he is fit. I think his back was the issue on the clay this year.