Yup - Drummond has been injured for 2-3 weeks now, which is why you saw McQuarters returning kicks.
Drummond is reported to be healthy and is supposed to play and return kicks this week.
McQ will primarily be used at CB as Dre Bly just had surgery on his wrist and will be out at lest 3-4 weeks.
Now that DET has lost both its top CBs again this yr, how smart was it for them to give McQ that small contract? One of the smarter pickups of the Millen era if you ask me.