"Roy Oswalt rejoined the club Saturday after leaving Thursday to return to his home in Weir, Miss., for personal reasons. The right-hander, who has eight days remaining until he can come off the disabled list, played catch Saturday but did not have a timetable as to when he would throw his next bullpen session." - Courtesy of MLB.com
I subscribe to the philosophy of a stud is a stud, and Oswalt is a stud. I say take a chance, but only if the guy you are dropping for him is nothing special.