If the shoots are coming from below the graft line then it will be an unknown rootstock tree. I dont see the graft line in your photos. In all honesty though it looks like even the new shoots might not be totally healthy.
I followed these instructions from SLN when I planted.
"When planting standard size grafted fruit trees like ours, it is best to encourage them to become at least partially “own-rooted,” that is, to promote rooting above the graft union. To accomplish this, you must plant grafted apples, pears, plums and cherry trees an inch or two deeper than they were in the nursery, with the graft union (near the root collar) below the ground."
I don't believe that I have any roots growing from above the graft union but I could be wrong. The shoots however should be above the graft union, therefore making them a Summercrisp correct??? They make look they way the do because they were under the window screen until right before I took the pics.