Piccolo can be as low at 75% and be fine. The Cell Junior is not trying to annihilate Piccolo from the get go and a 1.33x gap is not enough to put someone in the dirt that quickly. So anywhere from 75-83% is fine. Piccolo is beat to shit, he looks terrible against a Cell that's only recently really tried to put him down. Could be higher, but I don't think Piccolo is all that close. Piccolo vs Vegeta during the Androids and the Cell Game could be similar imo.
Well as I said SSJ. Imagine if KKx2 Goku and Dodoria were around. Dodoria suppressed himself to KKx2 Goku's level. You don't think Vegeta wouldn't mind letting Dodoria power up? The team of Dodoria and Goku is getting fucking smoked by Vegeta. The team up shit only works when someone is decently close in power, Dodoria is pretty much pure trash to Vegeta.