How strong is Base Vegetto?

[withheldforprivacy]

The implications suggest that the Potara fusion multiplies the higher battle power. The Old Kaioshin was talking to Kaioshin before and after the fusion, he wasn't using Kibito as the measuring stick. It is also illogical for it to amplify the lower power level, despite it far more effective than the Metamoran fusion -because depending on how low the battle power is, Old Kaioshins statement of it being more effective would then be considered a false pretense and Akira Toriyama has no reason to lie to us.

Math wise, it applying to the lowest level is the only way to make reasonable PLs, unless you want to have Gotenks weaker than Piccolo.

Multiplying the highest battle power makes much more sense... especially within the context of the statements and logic.

AT didn't have maths in mind when he wrote this. But, when you try to make a mathematically sensible list, you have to apply it to the
weaker PL. I don't think it's so unreasonable to assume Old Kai could be referring to both of them when he said ''you''.