I was only doing the current, official, top ten from the week beginning 23/02/2015 in those calculations, but as Cilic will be ranked 10 on Monday due to Dimitrov's loss in Acapulco, his numbers are:
All points from last 6 months (inc USO and AO) 2350
Not including slams 350
Including AO but not USO 350
In the category Ranking based on period from USO to week beginning 23rd Feb 2015, including both USO and AO, Cilic would sit at 7th, and Nadal would be pushed out ( though if rankings were based entirely on the last six months Nadal would be ranked around 77 at the moment due to having not played much post-Wimbledon due to injury and illness).
In the numbers not including slams Cilic would sit at 10th. He wouldn't feature in the numbers including AO but not USO.
Take away Cilic's USO points and he's doing pretty badly with only 350 points. But he took time out at the end of last season due to injury and has been out all year so far.