he could potentially go in the NBA draft, and how many millions more in potential dollars are available if you move from second round to first round, or even top 15. Second rounders aren't even guaranteed a roster spot.
Furthermore, Mika is certainly a much hotter commodity after this year than he was after his freshman year. Is that because of his own development, the work of the coaching staff, the competition, or all of the above? If not, then why not leave for the NBA after HS, or after his freshman year? The fact is, there's always something to be gained by some patience, dedication, and hard work. So to say he has nothing to gain from staying one more year doesn't match the actual reality of what happened between year one and two for Mika. Take Jimmer for example. Even though Jimmer ultimately got abused by his NBA coaches, his contract still at least garnered him millions before he got traded, and that contract would not have been nearly as lucrative if he'd left after his junior year.
And as far as playing in Europe, possibly being a star there, and earning that money, Mika can always do that, no matter when he leaves BYU, as can almost any good player. It's not about any foreign league's potential dollars. It's only about the potential NBA dollars. There is NO WAY that ANY player should leave college early just to garner a "coveted spot" in a foreign pro league, as that money is almost always there for the taking for players of Mika's caliber.