Last year in Di Fara's first appearance in Zagats, it got a 28 for food, but did not show in the Top 50 food listings. OK, it was listed as "low voting" (this year upscale Donguri (in the Inner Borough) had a 28/low voting and wasn't listed either).
But Di Fara's got a full vote this year and a 27 rating. It was the only 27 full vote rated listing not included in the top 50. Grimaldi's with a (in my opinion, undeserved) 26 got into the top 50 listing, so what's Zagat's excuse for excluding Di Fara's.
Note Sripraphai also showed up this year with a 27, but with "low voting". Let's see what happens next year when it will probably come in with a full vote.