So I can't remember anything about jade blood adults and if their sent off planet like every other caste, because isn't it jades who look after the mother grub so technically they already have 'jobs' on alternia and if they are sent off planet what do they do?

I believe that Adult Jades are also implied to be sent off-planet. Given Caste Roles, it’s possible Jades are considered to be caretakers or medics of some sort. There’s also the possibility of there being more than one Mother Grub maybe.