If Shontrelle is our best option at KR then have him play it, we need big plays whenever we can get them, can't afford to miss a big play because we are worried about a possible injury. We have quality depth at RB, that would be the only reason not to have him return, if he is our best returner of course.
On another note, against power running teams on our schedule, I think you'll see the same linebacker switch as last year, Klein as SLB, Matt T as MLB, and Knott at WLB. This depth chart is just how we'll play against the majority of the teams on our schedule.