BOULDER — In the not-too-distant future, we’d all like to have the bank account of Colorado sophomore Jabari Walker. He’s going to be an NBA millionaire soon enough. Guaranteed. But Walker is not yet a money player. “He’s 19 years old. He’s still learning,” CU coach Tad Boyle said Thursday. Growing up to be the man who can put a basketball team on his back is hard to do.