My researchers? You mean scientists? So scientists are on my side, and not on yours? What do you mean they don't know what a bird is? Are you trying to say that a pterodactyl is a bird?
Secondly your dating of the strata often is reliant on the life within it and your presumed toe ancestry
Wiki:Confuciusornis is a genus of primitive crow-sized birds from the Early CretaceousYixian and Jiufotang Formations of China, dating from 125 to 120 million years ago. Like modern birds, Confuciusornis had a toothless beak, but close relatives of modern birds such as Hesperornis and Ichthyornis were toothed, indicating that the loss of teeth occurred convergently in Confuciusornis and living birds. It is the oldest known bird to have a beak.[1] It was named after the Chinese moral philosopher Confucius (551479 BCE). Confuciusornis is one of the most abundant vertebrates found in the Yixian Formation, and several hundred complete, articulated specimens have been found.[2]
Just a bird 125myo now extinct, untoothed and living along side our modern birds supposed ancestors still with teeth. Oh yeah,convergent evolution explains it. I cannot provide a devonian bird but I can illustrate that your researchers have no idea about any birds. What on earth has mezmerized you to the point that you think some little dino is reponsible for all the bird life here today. It is easier to believe you just haven't found a devonian speciment than to believe a warm blooded, hollow boned bird evolved from any cold blooded, solid boned dino. Oh yeah..I think I remember your researchers trying to make dinos warm blooded but that stuffs up the reptile thinggy..Oh what a mess. I am glad it is yours!
You haven't taken birdy sides yet either. Are you not game? Dino or glider? Guess, everyone else does. Maybe birds evolved from flying fish and both guesses will be wrong.
Do you think humans will sprout wings one day and help the environment? Now there is a genetic engineering goal if ever I heard of one.
Are you saying that the fossil record contains birds in every strata, including the oldest? If not, what on earth is your point?
Older layers contain no birds or bird-like creatures.
Then we get winged, toothed, intermediate creatures.
And finally, modern birds.
Kind of like every other sort of organism.
If every "kind" has been on earth from the beginning, why don't we find every "kind" in the lower rock strata?