I've gotten about 8 or 9 4stars from factory since launch, at least after early access. Just 3 factory slots, used my pre-reg cores on it unlocking 2 of them. I'd say about half of them have been dupes of ones I've already had.
Pretty sure that 5star emblem from pre-reg is random. My main account got a accuracy emblem with mediocre sub stats. I don't even use it on my Perishing. My alt account got an evasion one.