Logically with a powered control system and the aircraft in aerodynamic trim the elevator would be in line; however I suspect that the designer chappies may use a tad of elevator or non ideal tailplane angle to optimize drag or structure loading. But this does not fit in with flaps extended as the question asked. Again many engineers / designers do not like ‘no load’ conditions, particularly where systems vibrate, thus with additional flap downwash the elevator may be designed to carry a small ‘engineering’ load and thus be offset. If so, then the question is the usual JAR ‘aerodynamics / controls’ type of question that as no connection (pun intended) with the facts and little or no value in operation.