Well, since you asked
I'm not sure if I'm understanding right, have you received all your children in the last 5 months? If so, there are too many kids going through transition right now. It takes 6-12 months for most kids to really settle in emotionally. By "stirring the pot" by adding new kids, your already-there kids are going to start regressing some. I would be very concerned about those 8.
Now, to the other two kids, they have just gone through a trauma, having left a family that they thought would be forever. I don't know what the reasons are for them leaving, but if it was bc of their behaviors, would you really want to subject your 8 kids to that? If the disruption was bc of their pre-adopt family, these kids are going to need a lot of one on one and bonding time to regain some sense of security. With 8 other children to care for, would you really be able to provide them with that bonding time?
I only have six kids, five at home, and I know how hard it is to meet each child's needs EVERY single moment of every single day. We do the best we can and I THINK we're successful, but I know doubling the kids I have at home now, I could NOT do it, especially if even one kid has RAD.
I think you've made a very wise decision! God bless you for even thinking about taking the other two. Just give your 8 all the loving you can! Pray for the two, that they find the forever family that they deserve.