Because Wroten is likely to be one of the two best players available, and also because he is so versatile, and could probably even play spot minutes at the 3 against certain SFs, like Tony Allen.
Wroten would be the best playmaking backup PG Rondo has had, and he also compliments Bradley very well, because Wroten can guard the bigger guard, and be the PG on offense and let Bradley play his more natural SG.
Scoring is scoring, and NBA rules favor guards who can get to the rim and score and draw fouls. Playing off of Wroten doesn't mean you're going to stop him from getting to the rim or dishing off to the open man, and as he develops a 12 foot pull up jumper in the next year or two, he becomes a deadly offensive weapon, and high scoring 6th man.