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I don't know anything about British succession rules but I do know that both Wilhelm II and George V were descended from Queen Victoria. Was Wilhelm II anywhere in the line of succession? If so how many others would have to die before it got to him?
It would certainly make things interesting if this happened after the death of Archduke Ferdinand but before British entry in WWI.
Or how about just after WWI ends?
For that matter could George V have become Kaiser?