Exactly.
I mean by that logic, Luffy lost to Arlong, Enel, Lucci, and Crocodile(died of Poison last time) as well. and Satori is the strongest villain of all time because it took Luffy AND Sanji to win.
One piece doesn't work like that pal. If you want to get technical, the mugiwara's have been consistant in strength since the beginning. Up until CP9, they were always physically much stronger than their opponents. Its the abilities and situations that make allow their opponents to fight evenly with them. CP9 was the first group who had the physical strength to match the strawhatsthe big three at least) so they evolved their styles.
Point taken, but I don't think you understand quite what I mean…
anyway, there were plenty of opponents that matched the strawhats physical strength before CP9, but not many that matched their tactical strength. Daz Bohness was just as strong as Zoro, and Bon-chan was just as strong as Sanji (Hell, their fight chapter was called "Even Match"). And Mr. 4 was much stronger than Chopper and Usopp (combined, even).
The Skypeia opponents were jokes (yes, including Enel), so the fight with Satori hardly counts.
CP9 is overrated, because if it wasn't for the Tekkai crap, they'd have been owned fairly quickly.