You are correct, I was too simplistic. The point I was really getting at was that if he happened to make more money than she does, or if their incomes were substantially similar, then there was little chance that he would be able to collect alimony.
- - - Updated - - -
Then temporary alimony is not off the table, but the actual dollars earned matters...also again, the issue of you changing the locks is problematic. Legally she has just as much right to access the rental unit as you do. You actually want to hold her to her obligations under the lease but refuse her access at the same time. That is a problem.

