Great news,
I did lose all of my potted trees, VdB, albique petite, and a few unknowns as well ans lost some in ground trees. all my inground trees where top killed over winter. i did lose a osbourne proliffic, black bethlehem, and one of my RdB trees. things didnt look to good for my hardy chicago i had for 5 years. but today after bringing the wife home from the hospital (she had cancer on her thyroid) i noticed that the HC has 2 little sprouts starting out below the soil line next to the 3 inch diam trunk which was top killed as well.
just goes to show that you never can tell. only time can tell.