So called crash retrievals

Not that I believe there has been crashed alien craft but I just watched Jesse Michels and Eric Weinstein saying they can't understand why no theoretical physicists are employed by the gov or private aerospace companies to understand and reverse engineer supposed downed/landed/crashed alien craft. Supposedly it's engineers and material scientists who work on them but no top physics people. Well when you think about it what could theoretical physicists do? These craft apparently have no propul...