There is no denying that each of those fighters looked less than spectacular prior to fighting Manny Pac. They have all been top fighters at some stage in their careers, but when Manny faced them they were either of coming in off of recent KO's or a poor performance or string of performances.

You can look at it another way and say that some fighters come back well after a heavy stoppage or get better in their 40's, but those are exceptions to the rule rather than the norm.