Janus Marius
Plo Koon Rulez!
Possibly. What we COULD surmise is that Revan canonically knew more "Terrible ancient sith" techniques than Nihilus, as Nihilus basically had one.
True. With the quote in line, it's possible Revan had more knowledge, and certainly more time to access it seeing as he was the first one there. However, to what extent remains to be clarified upon.
But I guess if the logical deduction isn't admissible then Revan's abilities are for the most part, unknown.
Logical deduction is admissible, but inconclusive.
For example, we can deduce that Revan was a Sith Lord, that he had first access to Malachor V, and that his techniques later on were simply amazing to Bane of the Brotherhood. We can also deduce that from this same source, Nihilus came to his ability. However, there remains a few things we cannot conclusively prove, despite the overall deduction:
1. We cannot conclusively say what those techniques are, besides the Thought Bomb.
2. We cannot say if Revan has truly mastered them or applied them; simply that he had access to them and that he knew of them, enough that he could put the info into a holocron.
3. That in perhaps the Sith-equivalent of Ossus Library, Revan was able to study and scrutinize every single source while waging war, whereas Nihilus who had spent his apprenticeship on the planet, was somehow less able, or was unable to use different sources, etc.
4. We can not also conclusively decide upon where Revan and Nihilus sit when it comes to upper limits of the Force. Nihilus' shown instances set him higher, but Revan is still relatively unknown for the most part. I personally blame the game makers for using this lure of mystery and uberness ploy, as all we can do is make assumptions based on hearsay and feats not described like as in a novel or movie.