>>6416671) Birds were already birds at the same time theropods were alive.
The entire scientific community used to call Archaeopteryx birds because they obviously are. They have the same exact joints and muscles as modern birds, it's really unreasonable if you are shown just how exact the joints match modern birds. But now the scientific community takes the stance that they are NOT birds, because it breaks the new (and fucking retarded) evolutionary timeline, for it to work birds could not exist at the same time as theropods.
2) You have not a single transitional fossil. Furthermore, you don't even have a single fossil between fur and feathers (feathers are extremely complex).