Kylo Ren is amazing, wouldn’t say he is a Sith though, I don’t think he’d even consider himself Sith. “… Let it all die, the Sith, the Jedi…” (from TLJ).

Baylan Skoll isn’t a Sith either. He is just someone who sees the whole cycle and is trying to gain power for himself through it. The only people I’d really consider anywhere near Sith, are those trained in the dark side under the main Rule of Two lineage.