VSG has no maintainance and pitline issues. It has much better facilities than MAO in above cases. What makes you think MAO is more suitable for Rajdhani and not Vasco ?
I 100% guarantee you that Vasco has more people from Mumbai, Gujarat, etc settled than Madgaon but due to the disgusting attitude of IR all trains are given for Madgaon. Lots of Vascokars are forced by IR to travel to Madgaon unnecessarily when Vasco has a very good terminal. There are more pitlines at Vasco than Madgaon.