So you think Vegetto would've been weaker than Gohan-Boo in SSJ1 if Goku had not unlocked SSJ3?
Also what's your reasoning for base Gotenks appearing to get huge gains post-Rosat even though Goten and Trunks did not gain more transformations? Just due to SSJ mastery/unlocking SSJ2 and 3?
Yes, surely if Goku is dramatically weaker, his potara fusion as well. Remember, it's more about top power than transformation.
If Goku is 100 versus a 400, clearly the 400 power Goku would add much more to the fusion.
So 2 Vegeta's would be far weaker than 2 Gokus fusing.
Yes, I think the only reasonable answer we can have for Gotenks getting such an absurd boost in power, despite not seemingly gaining much power themselves nor unlocking new transformations as individuals, has to be because of Gotenks unlocking of the transformations.
As I mentioned before, adding transformations to the individual greatly increases the Base Fusions power. This is like that in reverse.
It's not coincidence that Base Gotenks Post Fusion power is now that beyond a Super Saiyan 3 once he unlocks Super Saiyan 3.
I think Base Gotenks is kind of crediting the boys with having Super Saiyan 3 as individuals despite only having it as a fusion.
Base Gotenks Post (Highest Form SSJ3) > Super Saiyan 3 Level
This suggests Goten/Trunks fusion considers them to have a psuedo SSJ3 as individuals.
Base Gotenks Pre (Highest Form SSJ) > Super Saiyan Boys Level
I think this is no coincidence here. Makes sense, huh?