It has been since like this for 2 decades. The present TT of Chennai Rajdhani is same as that was in 1990s. Yes I agree there is scope of speedup and Mission Raftaar will do something about it. EMU OTing Rajdhani is a curious case. In many cases, the less important trains are given starters early than important ones. Like when I travelled in Gondwana Express, it was allowed to depart early than SBC Duronto at JHS. Similarly Amit Bhai uploaded a video in which South Bihar Express departed before Howrah Duronto. Not a proper OT IMO.