Typed a whole thing last night, my tablet lost it, it was way late and I was pissed, so,,,
The alleged relation is based on a superficial similarities. Birds predate therapods by 70 million years, and you can't be older than your ancestor. Feathers on the first two therapods indentified as having them turned out to be faked. The "But the ones after are legit" line seems weak.
Studies of dolphin corpses decaying in mud showed branching filaments of fungus extending outwards into it which bear a striking resemblance to these 'feather' imprints.
Not saying this all totally rules out feathers - crocodilians have a gene necessary in making them too, indicating that prehistoric non-aquatic types may possibly have had them as well.
But then there is the pelvis. Therapods are saurischians (also including the big long necked sauropods) - reptile hipped dinosaurs. Ornithischians (horned dinos, duck billed, etc) are bird hipped, as their name means. But a lumbering elephant sized creature as ancestral to sprightly lithe birds somehow is inconcievable.
There's a crescent shaped carpal bone therapods and birds seem to share, but that turned out to be different bones evolved to look similar because of a bent wrist. Their wrists are bent at different angles also.
Basically it's superficial similarities resulting from convergent evolution. Effigia was once classed as a therapod as well, till distinctive ankle bones peculiar to crocodilians revealed it to be in that order, not a dinosaur at all.
Then there's protoavis, which looks like a more advance bird that archaeopteryx, only it lived 75 million years prior, round the dawn of the dinosaurs. So definitely not a theropod, and very possibly not even a dinosaur. Problem with that creature is that there are questions if it might have been cobbled from different species, its bones having been found jumbled together in a deposit.
Checking up on the latest on that, I found one source stating three specimens have been found. However, all the rest said there was only one, so who knows. The skull was more birdlike in terms of eye orbits and an jointed upper jaw, unlike therapods...
I figured you knew that was me. My tagline also indicates it.
I retired that because I like Modda better, and that was abndoned too long. Jack was originally just for the occasional political or religious debate, so it can get downvoted and trolled while I went about regular stuff as Modda, but then it took over,,,