If they go full tank and trade both Parsons and Nowitzki, I'd send them Lee, their choice of Sully, Olynyk, Young, or Rozier, and their pick this year for Parsons. He'd be a nice piece for our roster, and we could probably be a top-4 seed in the weak East next year with a lineup of:
PG: Smart, IT, Rozier
SG: Bradley, Young
SF: Parsons, Crowder
PF: Lee, KO
C: Johnson, Zeller