What I'm trying to prove is Goku can beat Nappa without Kaiohken because the true purpose of using the Kaiohken at that moment was to prevent Nappa's attempt in killing Gohan and Krilin. Nappa tricked Goku, it has nothing to do with speed because if Goku knew what would happen then there's no point in using the Kaiohken.
If he could have beat him without the Kaioken then he wouldn't have needed it to stop Nappa from going after Krillin and Gohan. His full speed would have been enough to catch him. It wasn't. Therefore he and Nappa are on similar power scales. Both around 8,000.
Goku didn't take the fight seriously while Nappa gave it all. Nappa has the advantage when he used his ultimate attack, Goku's ORDINARY fireball blocked Nappa's ultimate attack and Vegeta even comments on Goku's ability to block it as such close range.
First of all, Goku doesn't use 'fireballs'. (Seriously, this is a pet peve of mine. There's
no fire (or heat, for that matter) involved in ki and it drives me up the wall to see 'fireball'.)
Secondly, correct me if I'm wrong here but didn't Goku use a Kamehameha and not just a generic ki blast? Even so, it's perfectly logical that a standard 8k energy blast would cancel out another 8k energy attack. It's just common sense. "Utlimate Attack" or not it's still just a basic non-charged attack.
Piccolo burned Nappa's back.
Yeah. Piccolo did extremely minor damage to a Nappa who was opperating with at about 4,000. He had the rest of his power still in reserve at this point so it's perfectly logical that charged attack from Piccolo would do at least a little damage.
Also, looking over your posts again you seem to have a misunderstanding of the concept of 'base level'. Goku's 5,000 power was
not his 'base'. That was his supressed level. A manual and concious reduction of his power. His
base was 8,000. Just as when he landed on Namek is supressed level was 5,000 and his base was 90,000. Or are you going to say that he fought at 5,000 against the Ginyu Force as well, becuase fighting at 90k would wear him out too fast?