You've got to be kidding me. Ginobili is an all-star and the team's leading scorer. If Kobe had Ginobili's bad knee, then you can say the injuries canceled each other out.
Bynum is our team's best post defender, best rebounder, best shotblocker, and the zone buster. With Bynum in the game then Duncan doesn't play nearly as well as he did against Gasol and Pau starts looking like Wilt because he's guarded by Oberto. Not to mention Gino now has to keep Odom off the boards... which is not possible.
Bynum by virtue of being a game-changing big has far more value than the Spurs 2nd-3rd option (in the playoffs).
If both Bynum and Manu are healthy the series still ends in 4 or 5.
I'm saying Ginobili's impact on the Spurs rivals Kobe's impact on the Lakers.
Manu isn't the offensive engine that Kobe is... Not only does he not score as much but he doesn't create as much offense for his teammates or draw nearly the same amount of attention. No fricken way does a team built around Manu have dozens of players having career years or shooting career highs. No way is Manu responsible for creating Duncan and Oberto's offense like Kobe is for Gasol and Odom (neither did much of creating their own offense in the playoffs).
Manu's impact is on the level of Marion in PHX... maybe even a step below that because Marion is such a superior defender and rebounder.