[FMadera]

Tim,

As a rule of thumb, anytime you can assess a penalty that is less severe than a loss of rally, it's preferred. Ideally, you want to catch the illegal replacement before the beckon of service, so as not to have to assess an illegal allignment penalty.

I don't think they are trying to say that there is no preference, just that if you can get it early enough, the penalty would be UD, and if after the beckon, IA. But UD is almost always "better," so catching it as early as possible is most preferred.