We are saying the same thing then, imagine that

We are both offering alternative views.
I guess it's just the fact that we are reading the internet, and things like "And Misha you make me laugh, stating so obviously there is more than one ship. It is not a popular opinion" sound like you are shooting me down without even giving me the benefit of the doubt

But you know how the internet gets... things sound one way when we intend them in another.
Unpopular does not equal impossible. But I digress. It could have been the popular way too
Anyway, why do you assume the alien in the White Room those three years died? Textually, Pierce says:
You know, I might not have been around in 1947, but I know all about the crash. About the four aliens they captured: two dead, two alive. I’ve spent my entire career studying the documentation. Especially the three years of observation they made on the one held in captivity, right here in this room.
which, true, could be interpreted as the alien died... But then you have Kal showing up out of nowhere, and Max - who also assumed- he was the second alien who survived the crash, Nasedo being the first. Even in the OST, the special features have it that one of those two was the alien held in captivity for those three years.
Now, about the timing with the Granolith. The ship crashed in the middle of nowhere, during the middle of a thunderstorm. There could have been plenty of time before they were found out. The actual "Roswell incident" has the ship crashing either July 2nd or July 4th, and I think they give them a couple of days before they were located. So, going by this logic, you have the aliens stranded for two to four days. They had logistics problems, of course, like moving something as big as the Granolith, and as important as the pods to protect. With a failing ship, risk of discovery by both their own enemies and the humans, and possibly having either injured or dead friends/colleagues, they had to plan fast.
You are right, we don't know how many aliens were on board. We just know there were
at least four.
Kathy has this scenario, and the aliens prioritize the Granolith because it looks more like a weapon than the pods, making it a primary target for humans if they were to be found. Plus, they need a power source to keep the pods alive, so the Granolith had to be moved first. They steal a trailer to move the Granolith -they also gain human allies- and in fact they had three sets of hybrids, so they had started moving the first one and all is going according to plan until the military discovers them.
It's a lot more complicated than just that, but you get the idea.
I agree with the Skins ship still being here. But Courtney knew enough about the Granolith to want to use it to survive. One can argue it was because it would get her home, and that's what she was after. Now, what exactly did the Granolith do besides time travel... and being a ship to get back home... we'll never know. Obviously, Nikolas and the four guys at the Summit knew it was incredibly valuable... Would have been nice to know why exactly... The whole "it's a holy thing" always sounded to me like an excuse Lonnie made up out of the blue to say something to Max and Tess ::shrug::
Sorry about the confusion with Kal. It still sounds to me that you were wondering why Kal didn't say anything to Max if there had been other ships around in 1936, or in present time. If there were ships he knew about, I still believe Kal would have kept his mouth shut. He didn't want to leave Earth. And it was Max who was dead set on getting the crashed ship. He ordered Kal to look for it, an order Kal was bound to follow.
But retaking the scenario: Let's say for argument's sake that there were several other ships before the crash. Then civil war all but explodes on Antar. If all those ships were loyal to Khivar, then they would have returned. It took the Skins three years to figure out the podsters were on Earth, why would anyone stay around on this planet before that? How would they know the dead king would be resurrected by hybridization with an alien race?
Or, okay, they stuck around, and were friendly. Fifty years go by between the crash and the first time we get to see a shapeshifter. That's an awful lot of time for too many things to have happened to these other guys, maybe not at the hands of the FBI, but at the hands of the Skins. They've certainly had enough reason to believe they have a chance to get the podsters back even if fifty years have gone by.
So, as I see it, there's nothing to contradict that there were more ships around before and during 1947, even with allies to help the original crew of the crashed ship. They just got either systematically killed, stopped believing their king would ever come back and deserted, or we just didn't get to see them during the show.
On the other hand... let's say that there was only one ship during 1936, and was the same during 1947. How would they have gained access to the Royal DNA? Was Zan and company killed a decade before? Regardless, this ship has -for some reason- Royal DNA and is also researching humans. Then they decide to make hybrids and -for some reason again- end up crashing on Earth. Hhhhhhmmmmm... could be. You can actually make a pretty strong case about it, now that I'm thinking about it...
Most importantly, both theories follow canon.
Misha