Though what u said is true, I feel all trains should get enough priority so that trains can maintain their schedule. It is not that only Rajdhanis should maintain their schedule just because it is Rajdhani. When passengers pay for their tickets they do expect their trains to reach on time. If controllers troll normal trains and accord high priority only to their favourites, then it is indeed a sorry state. IMO any train, slow or fast, Rajdhani or Passenger, should maintain their schedule. After all, TT is designed based on all operational parameters like class of train, congestion, pf availability, priority, etc.