BUFFALO, N.Y. — Everyone is waiting on Alex Tuch. Tuch is arguably the top pending unrestricted free agent in the NHL this summer, and he and the Sabres still haven’t found common ground on a contract extension. This could come down to the wire. A lot of business gets done at the combine, but this week didn’t provide any additional clarity on the situation, according to his agent, Brian Bartlett. This has been a year-long process that has still left a gap between the two sides.