You can bet your butt that LaPorta is still in the minors because of the danger of his being a 'Super 2'.
Note the following:
What Players Are Eligible for Arbitration?
A player and club who cannot agree on a contract may agree to salary arbitration, provided that the player has enough service time in the majors. The following players are eligible for arbitration:
(1) Players with at least 3 but less than 6 years of service in Major League Baseball;
(2) The top 17 percent of players with at least 2 but less than 3 years of Major League service. These are known as “Super 2” players. To qualify as a Super 2, a player must have accumulated at least 86 days of service in the previous year. Historically, the cutoff point for Super 2 status is 2 years, 128 days of service, though the requirement has been as high as 2 years, 140 days in years past.
The Indians don't want Laporta anywhere near arbitration.
Tampa did the same thing with David Price.