To clear up a misconception - Osevett did not invent the RPO. Teams have been using RPOs for a long time. Some believe Brett Favre actually was one of the first to use RPOs on his own with his WRs.
Most pass patterns in RPOs use shorter routes. In JUCO, Osevett incorporated longer routes in his RPO calls. The big problem with all RPOs is linemen blocking the run, but going too far downfield when the QB pulls the ball for a throw. The OC and OL coach have to be in sync to run a RPO heavy offense. All and all quick short routes work best, but in JUCO Osevett found success using longer routes. It is yet to be seen if his design will work at a higher level of play