Could some clarify the saber styles of these jedi/sith?

What is Darth Sidious Saber style and or styles? Even if not confirmed what is he speculated to be a practitioner of?

What saber style or styles, did Darth Caedus employ?

Same with luke skywalker, exarkun, kyle katarn?

I asked Gideon about the first question and the best response he gave me was (it's not been confirmed).

Just searched a document I put together a while back and Luke's style is not given.

The same for Caedus.

Kyle: An "extroadinary sowordsmen" "One of the best in the order" doesn't tell you his form.

So, no help for you here. It's unknown.

Caedus used the Aing-Ti defense. Skywalker knew all seven and invented one. Exar Kun probably used Juyo because of his double blade and I have no clue about Sidious. I'm going to guess Djem So, but I could be wrong.

Aing-Tii defense is not a Lightsaber Form, nor does Luke know all of the Forms. He is noted as using Form V (Djem So) most often.