The draft, like the stock market, is about the future. The future on Mika's 3 looks good, given y/over/y improvement,
which has been very substantial, in his free throw percentage and his shooting range.
You are right that he is not long for a 6'10" guy. Think of him as 6'9" or 6'8", a good rebounder, a good finisher at the rim, a good outside shooter, with an excellent motor.
Mika is a good buy in the second round!