Okay!
Yes, Shaurya only told D and V about him defeating Jackass. He thinks that J and his other son died in the crash.
Mr. B knows only what Jackass told him. 20 years ago, J's plane crashed in Shinkai. He kept his other son in that Kavak ka egg and entrusted Mr. B with the responsibility to protect it. J told him that after 20 years, this egg will open and his son will come out who will be capable enough to destroy the earth. Mr. B created a protective shield around the entire area and so, Shaurya wasn't able to find the egg. Hence S thinks that both died.
Here, Mr. B did not mention J's other son. So, I don't know whether he knows about the second son or thinks that he is dead.
Coming to R's powers... no information has been given about his source of powers but since B mentioned that J said that his son is capable of causing huge destruction, there are chances that he might have done some experiments on his son and gave him powers...
Rest, maybe they might reveal more information in the later episodes...
Natural.
Yeah...
There's a high chance of that.
Yup. There is a high chance of that happening.