Yelell
We really have to clarify what are known facts based on concrete evidence, where those end, and what is theory or speculation.
BTW, the astro-physicist Neil DeGrasse Tyson is wonderful to listen to because he's so clear about just these things. He loves story but he doesn't mistake it for fact or worthwhile theories (each of which he clearly distinguishes). I recommend the recent interview with Charlie Rose (pbs.org) or anything else.
Well, I did say suppose, part of, and used a question mark, so I was not trying to be unclear that this was simply a one sentence thought - certainly not presented as fact. I have seen some of the direct similarities between some of the sola busca, and the grand etteilla 2 of swords, but of course I have no way of knowing how what different types of "influences" and "directions" became part of the final cards.