I know there have been questions on future of Joker in Buffalo and need for a better RD who can pair/fit better with other defenders Sabres have
To
D Henri Jokiharju (RFA)
11th overall pick
43rd overall pick
To
D Connor Murphy (2 x $4.4M)
18th overall pick
34th overall pick
Hawks jump to #11 in draft and get a younger RD back in deal
Sabres get a vet SAH upgrade at RD who can PK and while downgrading 1st round pick improve 2nd round pick.
Joker being RFA in need of raise and not potentially being fit in Buffalo makes moving on from him easier for Sabres IMO. He was also an inherited piece for GM and they may not want to commit a raise and extension to him. Hawks have plenty of room and signing Joker to a 2-year deal shouldn't be issue as he can hold fort on right side until Rinzel (Or I assume Levshunov comes along)
Murphy has limited NTC but given direction Sabres are moving (Nearly made playoffs) and Hawks being 2nd worst team in NHL and in full rebuild convincing him to waive it for Buffalo (If they are on his list) may not be a difficult move