Can Jarrett Jack actually take on a starting point guard role?

Four-fifths of the Nets’ starting lineup will return this season, which is a positive in terms of continuity, but the one replacement from last year’s starters — Jarrett Jack — has been harshly criticized for his extreme negative plus/minus rating accumulated a season ago. Critics have also pointed out Brooklyn’s record when Jack was the starter last season as a reason for pessimism.
On the surface it’s difficult to look at the data and build a case that the Nets are a better team sans Williams. After all, they went 11-16 overall when Jack was the starter, but 4-10 when Williams was inactive. A 27-game sample should be enough evidence to form a conclusion about Jack as the starter, but is it possible that the results and statistics are misleading?
Jack’s per-game statistics appear similar whether Williams was inactive or on the bench, but it’s worth noting that his assist-to-turnover ratio was significantly better when Williams wasn’t available.