Asik is not a franchise center but he is a starter who has proven he can put up 10 ppg, defends, and rebounds. That's what makes him foundational. There aren't many true franchise centers in the league, you need talent at the other skilled positions and a center who does his job. A rotation run by Rondo with Love (for instance), Parker, and Hayward would put up a lot of points and Asik would do what he needs to, like Luc Longley on those Bulls teams.
Parker's offensive upside is Anthony's but he's no slouch or lazy bum on defense. He'll be a complete player in this league.