Combat jj

Ok now this really excites me
Can u use elbows an knees? Or just punches?
And this will really test u cuz now in practice u will be getting hit so u will know what to do in a street fight
Also when can u throw strikes? When someone is on their back? Or when 1 or 2 knees are on the ground?
What are the rounds like?
How many?
How long?
Does it have multiple starting points like wrestling?
And this is gonna make some grapplers evolve some sick ass rubber guards so i expect to see alot of it in the ufc in 5 years
Oh and does this have a ranking system?
And will your previous bjj/10th planet jj belt transfer over?