Interesting theory but why? Why go to the trouble of involving MH370 and it's passengers when MH17 was scheduled to fly into the ambush anyway? The exact same FF is executed whether they shoot down MH17 as indicated, or if they had somehow switched the plane from the same airline. The switching part is fraught with issues as far as the potential to get caught and the immense planning and work that would need to go into it. Just doesn't make sense.