1: Lee is easily replaced by people like Suigetsu or Mifune with multiple attacks.
2: Shizune just *s, replace her with someone like Karin or Kabuto.

3: Lightning main isn't OP. You can shut him down easily with an immobile or acupuncture.

And no, I'm not saying this because I'm a lightning main myself. I don't use the meta. I don't use CB-S because it leaves my rearguard vulnerable to enemy mysteries.

I've been able to easily counter other lightning mains with Sealing Slash, so this has never been a problem for me.

Simple solution: figure out how to counter it. Once you figure out an anti-meta, you should be fine.