Stanford forward Rosco Allen, who led the Cardinal in scoring in 2015-16 has declared for the 2016 NBA Draft. This does not necessarily mean, however, that Allen is leaving Stanford. NCAA basketball players are allowed to register for the NBA Draft, attend the NBA Combine and participate in one team workout without losing their college eligibility.
NBA prospects coming out of college actually have until 10 days after the NBA combine to remove their name from draft consideration (this year's deadline is May 25). If they do remove their name from consideration by the deadline they are able to return to college play.