Shamarko Thomas got a respectable amount of playing time during the first half of his rookie season in 2013 as a slot defender until he suffered an ankle injury. The missed practice time and the solid play of veteran Will Allen kept him out of the lineup even when he returned from injury.
While Thomas represented himself well, all things considered, during his playing time, he was certainly not without his flaws. All players miss assignments, and rookies are most prone to them. Missing practice time for a young player is nearly always a death sentence for playing time simply because it greatly increases the probability of mental error.