Many GMs passed on Manu and Peja and Dirk. Most NBA teams were not very adept at drafting internatonal talent back then. Nash is not an overseas talent, especially playing college in the United States.
Tony Parker lasted until the very last pick in the 2001 draft. Your examples are poor because only very few NBA teams were scouting extensively abroad
to get players like that. The more appropriate examples would be the likes of Nikoloz Tskitishvili, Zarko Cabarkapa, Zoran Planinic, Jiri Welsch, Mickael Gelabale, the ones I mentioned that Isiah has passed on in recent drafts. You chose international players that are among the top 1% of international players. In recent drafts, there have been far more bad international draft picks because NBA teams have been infatuated with finding the next great international player. In some ways, Isiah should be applauded for not falling into the pit of the international draft frenzy.