Manu's usage rate during the 2004 playoffs was deliberately curtailed by Pop because he still had him on a short leash that season (not because of Manu's own limitations - which your post grossly implies).
When Pop finally gave Ginobili free reign, and Ginobili was fully unleashed we were all witness to what his compe ive fury could produce. The game from 2004 that I referenced was a glimpse at what Ginobili could give you when he was given more control of the playmaking decisions. In a game without Duncan or Parker, Pop couldn't micromanage Manu (i.e. Ginobili getting randomly yanked out for gambling on the passing lanes, etc...) - so Manu played the only way he knew how.
Manu's 2005 playoff run was uber-efficient and rivals any produced by either Kobe or Wade (on just about every advanced metric, VORP / WS / WS/48 / DPM / OPM / RPM / PER, etc...). Again, more revisionism on your part to try and fit your narrative that Manu's star wasn't bright enough.
I remember that 2003 game that you referenced earlier; Argentina lost their starting point guard, Pepe Sanchez at the start of the 2nd quarter and Scola at the half. No excuses needed, but the US always had more talent. That Argentina squad got the last laugh though on route to a gold medal the following year.