I was told alignment is pretty critical with chestnuts. Maybe I have not caught on to that. For me, they seem to respond to the graft injury by putting up more sprouts from the roots rather than pushing the graft. I know it is possible and I've seen it done successfully. I just personally have had very poor success with grafting chestnuts.
My largest ACCF chestnut as of today. Easily 35' tall with no sign of blight. Still hasn't bloomed yet, but nothing to pollinate it with anyway.
Its sister tree 30' away has grown back to around 15' since I cut it back to the ground after being top killed by blight.
It was the taller of the two at the time.
Latest ACCF update. Still very healthy and, while still no blooms, there is a single bur in the top. Certainly a blank with no other mature chestnut near, but if the sister tree holds up perhaps in the future.
It has grown back to about 15 to 18 feet.