Could you please tell us where they have mentioned their Gothram as Bharadwaja??? 
 And for your information mister Vaijayanagr had 4 dyansities and none of them were Kshatriya and none of them were related in Blood as well and one more Important Aspect not all of them were Kuruba also!!! 
 So what if Marathas took over the Kingdoms do they become Marathas???