That doesn't give greater Force reserves. He's drawing on his own natural power no matter if he's using the Light or Dark sides. That doesn't make him a rival to Vitiate's Force reserves at all. He almost died from that mental war, lol. Zannah's Force reserves do rival Vitiates though.
He almost died from that mental war because of the *draining*, not because he couldn't handle Vitiate's mental powers.
With Meetra replenishing the energy he was losing from the *draining*, his natural strength was able to lock Vitiate in a mental war for 300 years!
Drawing from the light *and* dark allows him to call upon extra energy when needed to supply himself. Assuming the world isn't on a nexus, Zannah can only draw on half of that energy.
That doesn't matter. Her technique will sap his stamina while conserving her. He doesn't have the strength, skill or speed to press her defenses enough to tire her out.
You think Revan, one of the greatest military leaders in history, is stupid enough to know that her technique will do that to him?
Revan will probably know this via instantly thanks to precognition, and come up with a plan to counter it. He's good at that.
Spinning your blade constantly requires more energy then just tapping at the barrier every so often.
Zannah will tire
long before Revan does. You think he will just recklessly attack her and waist his energy?
Also Revan had time to rest during the Star Forge battle, while he was making his new robes and talking to Bastila and Malak before fighting them.
Lol wut. There were Dark Jedi in the room he makes his new robes, and I seriously even doubt he made new robes.
Canonically, he wore the Qel-Droma robes from Korriban to the Star Forge, according to the vision that came true.
Talking to Bastila/Malak for a couple of seconds doesn't mean anything. They were on a *Dark Side nexus*. 😬