For The Shinies! A Guide For Thief

Pretty sure we covered this above, centovente is ALWAYS better unless you need more offhand accuracy, or are holding tp too long. it's not even close.

Twashtar + Glati's is not a bad option but, no, it is not best for Rudra's spam, which is by definition WSing as close to 1k as possible without regard for SC.

Aeneas + Twashtar is another good combination, but again, not the best.

Remember everything in this game is situational, asking for a best choice with very little context is not gonna go well. Could you be more specific on what content you are asking about?

I agree with the post above mine but just adding: Given the option of having all these daggers available, Aeneas is basically "If you want to make Radiance/Umbra because you like the animation" or MAYBE "for Aeolian Edge if Gandring isn't practical". Aeneas is, in my experience, not very useful.

Twashtar is also a very bad offhand, especially when compared to Centovente. I wouldn't recommend any of the weapon pairings you suggested for anything except the most accuracy-starved situations, and even then I don't think I would make those choices.

Some context is needed for what content you're doing, but if you're just spamming Rudra's between 1k -> 1.5k TP, I would use Twashtar/Centovente unless accuracy is extremely bad, then probably Twashtar/Ternion+1. I'd say you can quite safely put Aeneas in your mog locker and forget about it, from a THF's perspective.

Grasping my pearls!! In my mind, Aeneas is for when your buffs don't allow for the use of a non ilvl weapon on a particular target. Its 500 TP bonus helps the loss of offhand TP bonus not hurt as much. The high base damage and STP+10 also help mitigate missing twashtar's 70DEX and rudra's storm +10%.

I also wonder why you mention ternion over gleti's knife. ternion hasn't been relevant since odyssey came out for the jobs that can use gleti's. This is another use case for Aeneas; subtle blow. Paired with gleti offhand R30 and sherida earring, you can get SB65. I assume gandring path b with tp bonus offhand would be close or better than this combo, not factoring in accuracy, but that requires an additional gandring obv.