The spec of the "can_redefine_any_class" tells:
  "Can modify (retransform or redefine) any modifiable class. See IsModifiableClass."

Should it also say the following: " (can_redefine_classes must also be set)" ?

The relationship between the two capabilities is not clear.
As the "can_redefine_any_class" spec tells: "Can modify (retransform or redefine)..."
which means that it allows both to REDEFINE and to RETRANSFORM any class.

Then there can be a confusion on how to understand the capability "can_retransform_any_class".
So that the spec might need some clarification.