I have seen the newest Star War films, and Kylo’s main strength is going to be his force abilities, which has stalemated Rey’s own abilities. In the second movie, The Last Jedi, Rey held up a whole mountain slide of heavy boulders to help the rebels escape. In the same movie, when Kylo and Rey had a force tug of war over a lightsaber that ended in a draw and in The Rise of Skywalker they tied again in a battle of Force abilities. He might not be physically stronger then Blackbolt, but I can see his force abilities allowing him hang with Blackbolt long enough to get up close and use his lightsaber.
Now if Blackbolt uses his scream, Kylo is finished, but I’ll argue that Blackbolt probably won’t want to use it least he accidentally kill everyone else on the planet, especially that poor innocent turtle that just wished him good morning.