I got Mick and Ketch's birth year wrong. I thought the numbers on Mick's casket was random but I took a closer look at the sequence and it's, actually, Ketch's birthday. Ketch was the one that handled his body after his demise and there is a fantheory that he died to do a resurrection spell for Mick but it didn't work. So, it makes sense that he would have his birthday on Mick's casket, as a way of saying "I'm sorry I had to kill you but I brought you back". It may be a stretch, but still the sequence matches his date of birth.
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