Feel free to ask as many questions as you like @tuxcat!
My last own DE embryo is a 4AA, so absolutely fine but I've had no success with that batch of embryos.
My 3 donated embryos are 1 x 3AB which is ok/average and 2 x 2s (no letters after the grading) which are below average.
We'll thaw my 3 donor embryos and just see if their cells start dividing. If they don't then we can thaw my 4AA.
I really hope the 2 below average embryos wake up aok because if they don't I'd be left in a very difficult position. Legally in SA you can't mix embryos from different EDs.
But yes, if all 3 donor embryos wake up aok then I'll transfer all of them, but only because of their grading.