If you don't believe in the 75/25 split on recoveries to the end, then you have to track every PSA (Pooling and Servicing Agreement) of each individual ABS Trust and check to see which investors (i.e. class 19 preferreds, or class 22 commons) are supported by that performing trust.
Then tabulate the recoveries of each Class.
I personally don't have the patience or the time to do that so I just give the scenario of the 75/25 split on recoveries to the end.
Please if you are anyone else can do that...I would love to see the numbers.