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For what it is worth, here is my two cents.
Once a derog hits 90+,it is a major delinquency. My experience in modeling is that the effect of a 90+ decays linearly at approx one point a month max for each, with no major "bump" at two years.
If all four accounts show major derogs in the past, I would anticipate no more than 4 pts a month based soley upon aging of the derogs. But, of course, you may gain a point or so per month due to increase of their aging in your AAoA
I would realistically only expect a max of 5 pts per month. But just my opinion.