alternatehistory.com

In 1865, when Grand Duke Alexander of Russia died, his fiance Princess Dagmar of Denmark was greatly distraught, and her family worried about her health; in OTL, she married his brother, the new heir, who went on to become Alexander III, and their first born son became Nicholas II.

My general idea: Suppose Dagmar dies early 1866, Nicholas II is never born. The other Alexander, meanwhile, somehow dies childless before 1881, when his father is still assassinated. That would mean this guy -- who I know absolutely nothing about -- becomes Tsar. Except that he has a son, Cyril, who OTL became pretender to the throne, and a brother who toured the US and Japan.

How plausible is this? What does this mean for Russia?
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