Most people don't have a problem with their wisdom teeth coming in..
Yeah... it's essentially the same thing. However, you might be startled to know that whales have leg bones.
I'm sure that does some good for swimming, being covered and nothing more than a remnant of evolution - like our appendix.
This is the usual evo wild imagination taking over. That is not a leg bone, it is a fin bone. It unlike the aendix serve a vital purpose and it can't come fro a dog-like animal. You need to go back to school and take an intermediate course in genetics.
A change in the climate and region, of course, that would not be so "quite well" as you think. Similar to how a cooling earth likely forced several theropod species to produce feathers (and they did, we have fossil evidence for that).
If you think scales became feathers, going back to school and having some evo teacher tell you they did. Just save you money. It is IMPOSSIBLE GENETICALLY. It is a necessary evo speculation.
I didn't see you explanation of a nose becoming a blowhole. Once upon a time....and they lived happily ever after.
This ain't Pokémon.