In my opinion the Bucks will struggle to sign anyone unless they can move Henson, Teletovic, or Dellavadova. It's not like they have much cap room.

Ideal scenario for me, would be trade Henson & Delly to some where to free up cap space, sign Teague to be your starting PG, and resign Monroe, and Snell and I think you have a Top 3 team, then if you can convince Parker to come off the bench you have a pretty balanced team. Definitely would struggle a bit defensively with the 2nd unit, but they wouldn't be defending the best players either.

PG: Teague (S), Brogdon
SG: Snell (S), Terry, Vaughn
SF: Middleton (S), Teletovic
PF: Antetokounmpo (S), Parker
C: Maker (S), Monroe