It's easy to clown on Morj for staying on the "raid will fail" theory for a while, but a lot of his other analysis is quite good. Even with how wrong the raid fail theory was, Morj at least tries to extrapolate from how the plot structure would move instead of more insane stuff people tried to push (namely ZKK). Morj has some silly takes, but a lot of his analysis derives from how potential developments would impact the structure of the narrative, which most other theorists don't try to do. His stuff is well edited and enjoyable to watch.
Personal favorite is probably The Hidden Island. He doesn't upload frequently, but it's always a treat when he does. Really loved his Laffitte theory and there's more you can build off of it.
I don't see the appeal in Tekking. Every video he's got is longer than in needs to be with no editing. He doesn't have the charisma to carry it in my opinion, but he's clearly got some appeal I'm missing. Nothing against him personally, he's a pillar of OP YouTube.
KOL and other power scalers are generally trash. Underrated for the worst category is ParVision. He's trying to emulate better channels but has none of the insight. His annoying ass voice and over-editing do not help his case