It seems safe to say that Robert Williams didn't make the greatest first impression on his new organization, the Boston Celtics. 

Williams reportedly missed his flight this weekend and, subsequently, his first rookie practice, ahead of the team's summer league schedule.

The C's took the Texas A&M big man with the 27th overall pick in last month's draft, after Williams fell down draft boards in the first round.

Though many draft analysts had the 20-year-old projected to go in or near the lottery portion of the first round, due to his skill and upside, there were many questions regarding his mental makeup and effort level. Thus, the slide to the Celtics, all the way at the end of the first round.

Boston likely saw too high of a value to not take the 6-foot-10 big, who boast an impressive 7-foot-4 wingspan, though they might be seeing the risk as a bit higher than the reward at this moment.

For a guy that entered the league with a world or question marks attached to him, but a top team taking a flier on his potential, you would think he'd do everything possible to put those concerns to bed.

Not the case so far, though the C's surely have to hope their leap of faith pans out over the long haul.