Piccolo legitimately thinks that he is stronger. Your evidence literally proves it.
Exactly. He claims he’s stronger while fighting evenly with Goku.
People rarely claim assured victory at equal levels.
People do this all the time, what are you talking about?
Do I need to continue?
I think Jackie is Wind Chop level when he starts the match with Krillin. What evidence do you have to suggest he's not other than "Numba too big and scawwy"?
You don’t think Freeza (Initial vs Goku) = Freeza (Kicking Vegeta’s blast).
You don’t think Goku (Warm up vs Cell) = 50% Goku.
I’m not sure, but I think you have Trunks (Vs Freeza) > Trunks (Vs Goku).
You probably have Vegeta (Vs 19) > Vegeta (Initial vs 18), since Vegeta says he wasn’t going all out at first on 18.
When Recoome speeds up vs Vegeta, you don’t treat that as a power up. You don’t treat Goku blitzing Ginyu as a power up either. You probay don’t see this as a power up, at least not a 1.5x one:
Did Cell power up when he started blitzing Goku? Did 3rd form Freeza power up to catch to Piccolo? Did Fat Boo power up to catch Gohan? Did Raditz power up here? This is the only instance where Goku can’t see Raditz.
A character speeding up is rarely considered a power up. Freeza vs Vegeta and Cell vs Gohan are probably the only cases because they’re genuinely powering up, instead of just showing the full speed of their current power, and that’s because their strength feats also improve, so the plot requires their power to rise.
Reading the Budokai, there is no mystery about Jackie’s power. Everybody knows how strong he is since his first fight. When a character is suppressed, it means he’s hiding power and will slowly unveil it to everyone’s surprise. People are impressed by Jackie’s feats, but not surprised. There’s not a single scene where anyone thinks Kuririn is Jackie’s equal.