No. What could make you think so, other than a basic failure to understand the theory.
A mutation gives an advantage in that environment to a population of organisms. Another mutation arises that gives an even greater advantage in that environment. The older advantageous mutation is either replaced, or the two proceed to flourish side by side.
If you require a fuller explanation of this last point do ask some relevant questions to help you understand.
So then explain how the evolution of a feather from a scale gave an advantage.
Scales are for cold blooded animals almost exclusively and feathers are for warm blooded animals exclusively!
Scales are skin flaps that occur on the dermis while feathers start from a follicle sub dermally.
According to the theory the change from feather to scale took place over eons of time with one micro mutation after another.
So whenever , whatever creature started evolving feathers, they had to undergo the following: and they all had to give it an advantage
1. Genetic recoding to grow a feather follicle sub dermally
2. Genetic recoding to grow a quill.
3. recoding for the inferior umbilicus
4. recoding for after feathers and/or downy barbs.
5. recoding for the rachis
6. REcording for the vane
7. recoding for the barbs.
8. recoding for the barbules
9. recoding for the hooklets.
10 recoding to have it instinctly preen feathers
11. recoding to create the oil or uropygial gland
12. The creation of of the oil
13. Recoding instinct to teach the creature to learn to press to release the oils and then hold it to spread while preening.
14. Going from cold blooded (endo thermic heat regulation) to wartm blooded (entothermic heat regulation.
Have at it! This is just the change absolutely required just to go from a scale to a feather. Now these micro slow mutations also need to show an advantage in succesive generations.
Miss any of these- and the feather in that population dies!
H