By Andrew Gould The NFL Draft’s first round is clouded with uncertainty right from the top. With no clear read on how teams will kick off the selection process, fans could be startled fairly early Thursday night. One top-five pick is especially a mystery. NFL Network’s Ian Rapoport called the Houston Texans the “ultimate wildcard,” saying they could have a surprise in store with the No. 3 selection. “They are the most curious team, let’s say, in the top five,” Rapoport said. “And I hear from teams all over the map saying the same thing. ‘Well, it’s the Texans. It’s [general manager] Nick Caser…