A beneficial mutation, is beneficial by accident, according to a different environment.
Comes the dawn?
Nope:
If you get a mutation causing three fingers rather than five, and three is beneficial in an environment, then it's not a new morphology. Your claim is that it is. vacuously it is new in appearance, but the information is still for a finger. Your claim is that ab is new information. What you need to show LOGICALLY if you are going to claim ToE-proof, is the equivalent of your claims. The equivalent is a new type of finger.
No, the information is for a new type of
hand.
You are playing with the level of abstraction to get the answer you want. Your line of argument could deny any morphological change by saying "but the information is still for cells".
Capt.