Zeller can play well alongside Sullinger, Olynyk, or Jerebko. We saw that last year and there's no reason to believe that's suddenly changed. He can probably do OK next to Amir, as well, as long as they don't try to both roll to the rim at the same time. One of them has to space the floor for the other.
David Lee and Tyler Zeller are both effectively centers on offense. Playing them together was a bad idea, though I understood the thought behind it (they're both nice passers and have good hands). They should never be on the floor at the same time.