Not to be one of these people that judges someone solely on credentials and education, but I had to look into this guy you mentioned - Neal Adams.
"Adams attended the High School of Industrial Art in Manhattan, and shortly after graduation began working in the advertising industry. Interested in
comic books, he unsuccessfully submitted art samples to DC Comics, but did find uncredited freelance work drawing Bat Masterson and Archie Comics.
In 1962, Adams began his comics career in earnest at the NEA newspaper syndicated, working as an anonymous assistant on such comic strips as Peter
Scratch, Rip Kirby, and The Heart of Juliet Jones before being given his own strip, Ben Casey, based on the medical drama TV series. This comic strip
ran from 1962 through 1965."
Not exactly the background I expected from a person advocating some alternative groundbreaking theory of earth tectonics, or lack thereof.
"Neal Adams (born June 12, 1941, Governors Island, Manhattan, New York City) is an American comic book and commercial artist best known helping to
create some of the definitive modern imagery of the DC Comics characters Superman, Batman and Green Arrow among others."
he's a comic book artist - not a geologist, or a geological engineer or geochemist, etc etc. Not that he doesn't have any knowledge of these areas.
One can easily read literature and studies and grasp a pretty decent idea about a specific discipline. However, I think this sort of answers the
question why no other actual scientists advocate such mumbo-jumbo, or why we don't hear about it - not that it is being hidden from us. Ofcourse, I
wouldn't dare say that plate tectonics has everything right, and that there is no room for doubt/differing opinions. Ofcourse there is - that is the
whole point of science. It is not "all-knowing", and doesn't claim to be.
"Adams has put forth ideas on a new model of the universe in his Growing Earth Theory, a derivative of a widely discredited theory (credited to
Samuel Warren Carey) that the Earth and every other celestial body are growing."
with no evidence/testing or experimental observation to back it up. He simply made an animation and put it on youtube.