Yeah u r right other cities ke liye hona chahiye. After electrification of Kiul - Gaya surely new trains will be there. Another train from Gaya to new delhi starting i.e BGP - NDLS Express. Booking started.

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Gaya se south India ka connection lagbhag na ke barabar hai

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yes u r right. Atlest some patna trains should have been diverted via Gaya so that the purpose could have resolved. A new Humsafar Train from Patna to Banaswadi (Bangaluru) is going to be started in few months. May be It could have been run from Patna via Gaya - DDU - Cheoki - Jabalpur - Nainpur - Gondia (after completion of this new route which is scheduled by June 2019) - Nagpur - Warangal - Vijaywada - Guntur - Nandyal - Dhone - Pendekallu - Gooty - Kalluru - Dharmavaram - Yelahanka - Baiyyappanahalli - Banaswadi (Bangaluru). It is around 2600 km from this above mentioned route and less than usual route.

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pnbe to ddu via Buxar is 3hr+ run by a SF.
Pnbe to gaya 1:30 min max by SF and Gaya to DDU is 2:20 min by a SF without stpg. It a matter of 1 hr. I don't know what ecr think.
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Gaya se na to banglore se connection hai aur na hi kerla se mumbai ki bhi train hai wo bhi full ati hai kaya hum aise mp ko 5 year kyo chunte hai last ten years koi new train gaya se other state ke liye chali hai kaya isse bandhiya chhapra katihar bhagalpur muzzaffarpur jaynager darbhanga sahersa hai jaha gaya se jayda train khulti hai sirf ranchi ki train ek train bhai bangalore ke liye bhi chala do

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