I also initially thought it as cheap tricks. But now looking at Brindavan augumentation with 2 normal cacohes justifes the move since AC pax can travel in DD and normal people can travel in Brindavan. All classes of peoples are mutually benefited.
Also the timings of these two trains are more or less same.
This is a good innovation by SR.
We need to...
more... praise SR and not schold them.