For itineraries that depart later and arrive at same time are excluded in many case where we can give better option to depart later, and also i think we should give higher priority for trips that depart later and arrive at same time - compare to other.
I have one case where i am planning trip form station A To C. Train X is scheduled after 15 min from A to C, Currently when i plan trip it is giving me another train that take me to intermediate station B after 2 min. After waiting same time at station B i am getting same train X that i can have form station A. After finding this itinerary - trip of X is banned for finding second itinerary , so i can not have that option, which may be preferred in many cases.
There are so many such cases where i can not have alternative options in which i can depart later.