I don't know what his value will be even at 50% retained. Really tough to measure. Will Buffalo get a 1st? I have some doubts about that.
Zuccarello was traded, as rental, while having a better season,
and that return included 2 conditional picks,
each of which
might have become First round picks.
Hall might bring back similar conditional returns...
"The Rangers are receiving a conditional second-round draft pick this year, and a conditional third-round pick in the 2020 draft, in the deal announced Saturday night.
...
The conditional second-round pick becomes a first-round selection if Dallas wins two playoff rounds,
while the conditional third-round pick becomes a first-round pick if Zuccarello stays in Dallas next season ..."
Rangers trade forward Mats Zuccarello to Stars - Sportsnet.ca