I would love to see Martin play more but how do we know he's actually better than say, Tracy or Ragaini?
We don't know if he's better but if he was, he'd probably be getting some time. Its probably a matter of him not knowing the system as well as the coaches would like him to.
A lot of people fell in love with Martin a few years ago obviously the local kid doing well, but Tracy, Ragaini, & Lockett would have probably been just as successful, if not more successful, as Martin if they were playing against the same level of high school competition.
Lets not pretend that KF found those 3 guys on the scrap heap and Oliver was some blue chip can't miss player. Tracy was Indiana's GPOY & Lockett was all-state in Florida. And there have been plenty of great high school players from Iowa that couldn't make the transition to the B1G.