I’d say your most recent common ancestors linking Portugal and Lippe to everyone else are Frederick I, Margrave of Brandenburg-Ansbach and Sophia Jagiellon, Princess of Poland. These two individuals are the most recent common ancestors between at least one half of each couple that link JWF to Lippe and JWF to Portugal, and are common ancestors between all of JWF’s descendants, the Prince of Lippe, and the Duke of Braganza.
Would the Albania and Anhalt also be covered through the margrave and princess? In earlier threads, it was stated that Queen Geraldine of the Albanians was not descended from Jan Willem Friso, but was from his maternal uncle, Leopold I of Anhalt-Dessau. So Johann II of Anhalt-Dessau would link the Albanians and descendants of JWF; it goes without saying that Anhalt is also covered.
But no matter how you slice it, Montenegro will never enter the picture, unless a member of the dynasty today were to marry into mainstream European royalty. Things would be different, had the marriage of Crown Prince Danilo and Princess Jutta of Mecklenburg-Strelitz had produced heirs.
To think that even Prince Leka II of the Albanians is better connected than Crown Prince Nikola of Montenegro today ...
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