To be fair, there is a deleted scene of the Clone Wars that featured the ghost of Darth Bane, and in an interview, one of the writers talked about also featuring the ghost of Revan, as well. Not to mention that expansions to Swtor have been released after the date of cannonical cut-off. Sure, it's debatable as to weather it's cannon or not, but we'll hopefully get an anthology trilogy based off the Old Republic era

They really shouldn't have canceled the Clone Wars. They seemed to have a lot more great ideas for the show (like Revan making an appearance). As for SWtOR, I think it's been confirmed that it is not canon. I haven't played that game, but I've heard that it isn't a good game. I also heard that the Revan DLC was awful.[spoiler]Also, I'm pretty sure Darth Bane WAS in the Clone Wars in one of the final episodes with Yoda. That is where the confusion of if Revan is canon lies, cause Bane based his Rule of 2 of of Revan's philosophies[/spoiler][spoiler]Sorry for the long read, I love KotOR[/spoiler]

Yeah, I've never seen an episode of Rebels, but I've heard that Clone Wars was far better