Or, to be clear, there is no canon in-game except what the devs have established themselves. The Hero of Tython defeats Vitiate on Dromund Kaas and the Warrior receives a message about it shortly after he defeats Darth Baras. There is no option to spare Darth Thanaton at the end of the Inquisitor storyline. There is no option for the SW to kill a certain companion for his betrayal. And Tyresius wasn’t killed by the bounty hunter on Tatooine (however much I wish that was an option).
Those things decided by players are mostly a matter of personal taste.