Gondwana should be OT by TG only if Gondwana is too much delayed... but CR these days not giving OT for Gondwana..very rarely its happening..most of the times, its just trailing it all the way upto NGP and meanwhile Raj getting so close that overtaking becoming mandatory ...
if you take the NZM-BSL which takes the gondwana slot from NZM , most of the times CR giving OT for this train in a way that if TG overtkaing it then Raj too will as those all three has to arrive NGP on PF2 itself...