Your evidence for the evolution of feathers consists of:
"In past times, feathers were probably first used as insulation [which is highly debated in the scientific community] and were probably hair-shaped...At some point, some of the proto-birds developed branching projections from the early feathers...The next step was probably selection for barbules...Fast forward a couple of hundred million years of the same variation, mutation and selection and you end up with modern bird feathers.
"Probably, probably, probably"....
What would [not probably] happen, if one dropped a bust of Darwin off of the ivory tower at Darwin Central? It would [not probably] fall to the ground at a rate that is predictable and provable.
The theory of gravity is a good scientific theory.
However, the "theory" of the evolution of feathers consists of conjecture and assumed conclusions and has nowhere near the weight nor scientific support.
Your mentioned divine agent theory [which I am not a proponent of] seems almost as weighty as your evolution of feathers theory...probably.