re juke and jungle/grime, i think itd be different if there was a functioning "jungle" scene full of producers trying to better each other, but theres not, jungle is more of a kinda retro or historical form, not really a scene, so the only way theres gonna be an interesting interpretation is if it comes from the juke scene, Rashad had some tracks from a couple of years back when he was playing in the uk that definiely had a drum and bass/jungle influence, not so much with breaks but with more melody in the bassline giving it a jungle feel.
as for grime, i think its because jukes more sample based so there can be tracks taking loops from anything and juking it, where as grimes not so much, a big influence on grime has been trap (for a while now) which has a similar percussive sound pallet, but grimes less about the loops,and if you changed the tempo it wouldnt be grime.
i think a lot of the time when genres get mixed like these juke jungle crossovers its basically not quite as good as either...
as for grime, i think its because jukes more sample based so there can be tracks taking loops from anything and juking it, where as grimes not so much, a big influence on grime has been trap (for a while now) which has a similar percussive sound pallet, but grimes less about the loops,and if you changed the tempo it wouldnt be grime.
i think a lot of the time when genres get mixed like these juke jungle crossovers its basically not quite as good as either...