Lightsabers are a thing yes, not that Anakin has ever used tutaminis on lightning.
Challenge? KF Vader has nigh Yoda-Sidious level magnitude, is on their level as a duelist, and is physically better than anyone in the mythos up until rots.
KF Vader would wreck Revan causing him to split into 4 spirits this time around.
Held out against 4 of the best duelist of his era, ROTS anakin's lightsaber skill won't give him a definite advantage. who says anything about Lightning? Revan force chokes him, or stasis/drains him.
KF Vader, is not Yoda/Sidious level, raw power with **** all mastery of it. Doesn't automatically place him some uber tier above Revan. And i've never brought into the Plageuis>Valkorian nonsense, nor ROTS tbh. I have Revan=<Yoda.
I'm sure you can explain to me what any of this duelists has that makes them anything but fodder to someone who is on/near par with the very best duelists the mythos has had to offer as of their time?
Anakin has shown drain resistance vastly pre-prime and even prior to turning to the darkside is already being contemplated by multiple dudes to potentially be Yoda+. I doubt someone who can't hope to stand up to Vitiate is going to be ragdolling Anakin, an act that would require vastly greater power.
Lucas himself notes him to be up there with the two and to be "as strong as Sidious'. He's so close to Sids that as of ROTS he's already a "far more dangerous" dude thanks to his greater potential. Not to mention the likes of Windu were already contemplating whether he had surpassed Yoda even before Anakin in grew in power as he turned to the darkside. Your fanon aside, Anakin has plenty putting him near Yoda and Sidious's level. Something backed up by Anakin's wreckage of Dooku and his three-shotting of a fisto level swordsman in Cin Drallig.
Valkorian's placement isn't even relevant here. Revan gets nothing in terms of scaling from Valk when even Vitiate was going too be much for Revan, even with the help of a collectively superior strike team. Regardless of your thoughts on Vitiate, Revan is hilariously outclassed by the likes of Yoda and Sidious in terms of feats and hype/scaling.
Yoda has vastly greater feats and vastly greater scaling, so I'm going to need you to provide some evidence for that.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age