The Tigers sold high on Jackson.
His peripherals are not pretty and suggest a regression next year, and not a small regression by any means.
I believe your assessment on Schlereth is not quite right. He's a power arm with a fantastic fastball and a swing-and-miss breaking ball, the reason why he's a gamble is because he's not fully recovered from TJ surgery, but the stuff is there to be not a LH specialist, but a valuable bullpen arm.
Granderson, however, doesn't seem like such a good idea, they sold low on him, and they probably shouldn't have.