Ketel Marte continues to frustrate the Diamondbacks

Last winter, it was reported that Ketel Marte was on the trade market. But what was particularly interesting was that, at the time, it was reported (somewhat out of the blue) that he was causing frustration within the Diamondbacks organization.
His tendency to ask for days off seems to be the main point of friction between Marte and members of the organization.
That said, Marte stayed in Arizona. He's having a season that's a bit disappointing by his standards, but he remains a talented hitter a