Took my maple layers yesterday - seryu, shin deshojo and a plain vanilla Home Depot JM. The amount of foliage feeding the layer really seems to make a difference. The plain vanilla was jam-packed with roots, the seryu not so much. The foliage of the shin deshojo is interesting - above the layer the leaves remained a more reddish color, whereas the foliage below the layer turned green.
I only layered the top half of the shin deshojo and the rest will be used for grafting and eventually become a landscape tree. The seryu grew a branch below the graft, and the tiny stump has decent enough nebari so I'll see if this can be grown into another plain vanilla JM bonsai. The Home Depot JM has a thick stump over 2" wide but nothing grew below the layer. I'll see if anything pops lower down.