I think it is probably his injury at play. He is on pace for 21 HR, 19 SB, 98 R, .830 OPS over a full season not including the DL stint which made him miss over 10% of the season. He maybe didn't take the step up people thought he would be he is at least on pace for a normal year. Not sure what people are expecting. 830 ops would be 2nd best of his career, He is on pace to tie his career high in hrs, BA and OBP right at his career average. Seems pretty good to me