Katia was the doppelganger of Amara (as are Katherine and Elena) in the time of the Originals.  At Klaus's small dinner party with Elijah, Damon, and Stefan the Original brothers brought up Katia's name and that they were in a love triangle (Katia, Elijah, and Klaus) to taunt Stefan and Damon over Elena.  OK, here's my question...if the dopplegangers of Silas and Amara are 'destined by the Universe' to always find and love one another over and over,etc...where was the 'Stefan' doppleganger in that story? It was implied Katia was promiscous (and she had to have had at least one kid BEFORE the Michealson triangle...which she did not survive with the 'help' of Ester) perhaps it occured BEFORE? But she moved on to 'love' Klaus and Elijah!!! So Elena can move on from Stefan...right?????? Free will over Destiny/Fate