Think of each controller license as independent license. Although you have 2 AP licenses at 25 each you can aggregate 50 access points to the controllers (25 each). This would of course negate full redundancy.
But you can steer access points incase of failure in the above example.
Suppose you have 30 access points ( 15ap location 1 and 15ap location 2). You are over 5 access points over for full redundancy.
Suppose location 1 is a higher priority then location 2 and you want to make sure you have all the aps up at location 1. You can add a priority to the access points at location 1 so they connect to the controller before aps at location 2.
Just an fyi
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
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