Always good to have more bodies, but here's what the 'hawks re up against. In 2020 we have 54.591M in cap tied up. Seabs, Keith, Crawford, Toews, Kane, and Anisimov have NMC's of a sort. Saad, El Gato, and Murph don't. El Gato is also on an ELS, so that's a bonus.
Everyone else expires prior--meaning a resign if they're valuable which means more cap spent. By 2023 Saad, Ani, El Gato, Murph, and Crawford will have expired, and the number only drops to 33.4M
If the 'hawks need to add more for said transition, they'll want to get guys like El Gato/Forling now: On ELC's with good upside. Snuggie and The Joker fit. IMHO that means good drafting and not trading out good picks. Between now and then we're not going to have much cap to play with, so we'll have to go young, cheap, and unproven over established and expensive barring a major core move.
The real question moving forward is how much this core has left. Can they eek out another major cup run with attainable pieces, the right coaching, etc? The window could be closed. If it is, IMHO it's ill-advised to push for that one ethereal piece that will suddenly turn the core from goat urine to gasoline, and mortgage the future.