Halliburton/Fox/Hield/Barnes/Bagley
All 5 can run, space and make 3's...Fox will improve..... make it a race..
What do you have to lose?
It's too early to start Haliburton, unless it's at the shooting guard.
Having him start with Fox and Buddy, Haliburton would have to guard the SF and he would get destroyed by small forwards in the NBA (i.e LeBron, Kawaii, Doncic, Zion, Durant, Butler, etc). That's a good way to destroy a young players confidence and body.
Eventually, if he can put on some weight and muscle over 2-3 years and develop a Doug Christie type body, then maybe he can play the SF in the future. Until then, bring him in with the 2nd unit or eventually have him start at SG. He's not physically ready to start against SF in the NBA.