Excuse me, but what ?
Dante in SDT doesn't have only 2/3 of Sparda's power, he had HIS OWN POWER + 2/3 from Sparda
Also, you guys are already saying that the other 2 parts of his power are Rebellion and Yamato, but the game never stated this, and it would contradict the statement about Rebellion being the manifestation of Dante's powers, think about this
But anyway,
- We have the second novel stating that Eva was equal to Sparda and she couldn't defeat Void Mundus, while Dante almost One Shotted him, in base
- We have DMC4 with the Savior having Nero in his core and DS Sparda, and even then Dante was casual and didn't even used his DT
- We have Argosax, equal to Mundus, being easily defeated by Dante and Before the Nightmare even states that he wasn't a trouble
So, with this, even if we consider a Sealed Sparda for Eva and Argosax, Dante in base and before DMC5 was already far, FAR stronger than 1/3 Sparda without DT or anything, by his power alone
Base Dante >>>>>> Sealed Sparda (1/3) (possibly was fighting using at least one of the Swords)
And then he absorbs Rebellion (another 1/3) and Sparda (another 1/3)
We can say for sure that Awakened Dante is indeed stronger than Sparda, but Pre-Awakening Dante is only stronger than Sealed Sparda (by a lot)
Again I suggest two keys for Sparda