Okay so Champion.gg is inaccurate

Are you talking about builds or stats. For stats idek why riot doesnt just post it on their own website. Because they knoe the community checks the winrates why doesnt riot just release the official ones.

Probuilds. It requires you can slightly think for yourself though.

Does it say you are a much much lower rank but you should be challenger? Or how is it inaccurate.

As the darlek say...... EXPLAIN. EXPLAAIINNNN.

Wasn't there a case where one of the Rioters came out and say op.gg is the closest to their in-house data or something?

Dunno. Don't quote me on this.