FWIW, There were thee more incidents and in all the cases lower caste girl was raped by Muslim guys. So, much for unnecessary giving caste/communal angle to a case of corruption and power.
Caste exists among some Muslims too. Lower caste women bear the brunt of it because of their low social status. So no its not irrelevant. They suffer so much precisely because they are lower caste even in your examples.
Why can't you condemn all such cases. Why do you try to bring down one by citing the other.