I thought we had gotten to the heart of the issue.
Do you want me to leave this open for you or not?
Yes, a mutation constitutes a slightly "new" pattern, but I wouldn't call it an addition to the genome that would eventually allow for the formation of new tissues, organs, and other structures.
You have, it seems, agreed that there can be "new genetic material" but you topic has now changed.
Your issue is whether or not this can produce various forms of morphological change. Right?
If you do want to get this topic rolling could you explain what you think can be formed ("small" changes?) and can not be formed "new tissues"? It would then be useful for you to give your reasoning and evidence as to why the later can not be formed through the addition of "new genetic material" of the kind discussed.
The title could then be changed to something like:
"Impossibility of Major Morphological Changes". Right?