Rockbridge Pilgrimage: Hickory questions

Two years ago I made a pilgrimage to meet Cliff and pick up some Persimmon. This year managed to meet David at Rockbridge. Really appreciate the Carya discussions here which motivated deez nuts.

Picked up Pecan; Hark and Lakota. Shagbark; Lizzie Mtn and Cook. Shellbark; Schol and Stephens. David was running short on some of my preferred varieties discussed here so went with his recommendations. Appreciate the Lizzie Mtn tip Lucky P.

I can’t find any info about Cook Shagbark. Anyone know where this originated and how it compares to others?

Rockbridge has a short description of Schol which apparently had it’s origins forgotten.

I thought the top of this Shellbark was a flower to be removed but searching images indicates leaves will unfurl from this. So leave it alone?

Would like to get these above browse height before allowing primary branches. Is it safe to remove lower branching during growth season or should I wait till dormancy?