I am not sure but i think Reversal is not possible at Patna. They may have taken upto Rajendra Nagar for the reversal.
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PF 8, 9 & 10 are the only 3 platforms of Patna jn used for Gaya jn. And these 3 three are busy platforms with arrival and departure of all Patna-Gaya-Patna trains.
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Hence...
more... i feel that with only 3 PFs, ECR will never introduce trains on Gaya-Patna jn- Patliputra / Danapur - sonpur- hajipur - mfp - rxl side trains.