I was curious about this too.
If you are an AP holder, when you say you can "apply the 2 day tickets to renewal", what exactly does that mean? When it is time to renew your AP you can bring the 2 day ticket with you and they will give you the value of the ticket toward the cost of the AP renewal.
Also, wouldn't it be cheaper to book with an AP room discount when they become available and get a TIW membership at that point? This is something that you have to do the math and compare because it depends on how many are in the room, the number of adults and children, what resort level you book and the AP rate for the room. The TiW card is primarily for TS because there are only about 10 CS included.
Just curious.