Mike leake is not a robot. He's a 25 year old pitcher that has been earning at the highest level. He might be reaching the comfort level in the MLB that experimentation could allow him to Improve.
He certainly wouldn't be the first 25 year old pitcher that doesn't throw more than 95 to show improvement. Also it's not like his command is elite elite. He came up advertised as a command gut and has shown well. But he's not out of this world like a sheets, shields, Halliday, etc. a guy with his reputation might be able to take the leap from having good command to elite command. He obviously doesn't have the stuff to be a Halliday, but he doesn't have to be to show real improvement.