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Where would you put him as:
- lightsaber duelist
- overall Force user, no combat
- overall combat, lightsaber+Force

preferably giving examples of those you think he matches the most in those areas, from various areas, like TOR, PT, NJO, Legacy

Was he even a Lightsaber Wielder?

he was a Weapon Master

so logically

yes

far above luke

What form did he use?

His envelopment and control of the Ambria nexus is incredibly impressive, given that the Exile's companions needed a combination of a very strong connection to the light side of the Force and great willpower, in order to overcome and dissipate small palpable dark side miasma concentrations within the tomb of Freedon Nadd.

Ambria is canonically > Dxun, a demon world level dark side nexus and all concentrations of dark side energy therein, including Nadd's tomb.

P.S. One hilarious comparison is how Thon defeated stronger dark side spirits on Ambria than those that nearly killed Sidious on Korriban.

Probably Ventress+ tier. Although I would be keen on Ventress = Thon > DE Sidious.