dude, that's not investigating, that's 'explaining away'.
also 'bad science'.
like i already indicated: the 'coincidences' go well beyond simple resemblances.
i know it's tempting to find some comfortable solution and move on, but if you do you will come away with an assumption, not the truth.
It all boils down to likelihoods:
A.) Conspiracy to fool Americans (?) and the participants didn't even change their names to ensure it wouldn't be discovered;
B.) In a country of millions, some people share generic names and ages.
The other issue, of course, is the Texas Sharpshooter Fallacy:
It would be different if the conspiracy theorist came up with a hypothesis why the accident would've been staged, and then sought out the survivors (e.g., painting a target an then shooting at it to test his accuracy). Instead, he appears to have worked backwards by looking for the names first and then crafting an ad hoc hypothesis (i.e., shooting hundreds of bullets at a barn wall and then painting a target around an area where the bullets clustered). It's simply bad science.
in order for your argument to hold you have to demonstrate at the very least 1 instance of another case with similar
'coincidences' in a similarly constrained context and in similar numbers that are not the result of attempts at deception.
as for likelihoods:
what do you think is more likely?:
1: nasa is running a global conspiracy to convince people we are being visited by aliens
2: we are being visited by aliens
so what does that say about the odds of them lying about dead astronauts?
also your fallacy does not apply;
nobody is shooting at a barn, this information is coming entirely from looking at
astronauts and nothing else.
we are not looking at all of america and coming up with people resembling astronauts,
we are just looking at astronauts, and finding ridiculous coincidences between them.
how many people in america are astronauts?
what does that tell us about the odds?