So Allahabad is free to handle new trains meant for Ghazipur and Faizabad but not the halt of existing superfast train ?? Anyway it's just skipping Allahabad it's not going through a Flyover or something, it is getting late in that section and causing CONGESTION, five minute halt at that station wouldn't cause a management disaster for other trains.
Also Allahabad needs a new connection to Amritsar.