Coming up with the all-time best first draft picks in Dallas Mavericks' history is shockingly easy to do. Oh, you might quibble with the order of the top five, or how exactly to decipher a player's career achievements versus what they did in a Mavs' uniform. But after going over every top pick since the franchise took root in 1980, one thing is clear, the five stand out clearly. And five is about where the list ends. There were no hard choices to make. The NBA draft begins at 6 p.m. Thursday from the Barclays Center in Brooklyn, N.