Old EU isn't canon so yes I disregard that. Also Rey and Kylo being stronger than Anakin or even Palpatine is quite laughable this isn't being shown anywhere so yes I don't believe this at all nor is it a fact.
Luke never said that Kylo is the strongest force user he ever felt he just said that he didnt fear his raw strength/power before and when Rey also showed that kind of power he did start to fear it. Fearing doesn't mean it's the strongest force power he ever felt tho, that's your interpretation.
Kylo is just a shadow compared to Vader/Anakin and that's kinda the point of his story imo.
Anakin is the chosen one yes he didn't live up to his real potential but neither Rey or Kylo can match him when he was Darth Vader let alone his potential. We can see this shown in the movies and Clone Wars if you want to be canonical.
So I don't know where you get your canonical facts from but they are wrong.