Gordon is a PF, he doesnt have to be a great shooter. He has shown improvement in his career though from where he started.
Oladipo can shoot, his problem has been shot selection.
Payton has shown an ability to hit 3pt shots. He still doesnt take a lot, but he is also trending up.
Vucevic is a pretty good midrange shooter I believe. I dont know his stats, but he is usually on whenever he plays the Jazz it seems.
Fournier isnt too small to play SF. That is an absurd comment. Is his size ideal for a SF? No, but there are plenty of smaller players spending time at the 3.
This lineup is definitley beter on paper than Harris. Their defense gets better simply by taking Harris out of the equation.
This lineup nearly beat the Spurs
https://espn.go.com/nba/boxscore?id=400828677
Bested the Hawks twice in a row
https://espn.go.com/nba/boxscore?id=400828667 https://espn.go.com/nba/boxscore?id=400828658
A huge part of the trade is freeing up time for the much more talented Hezonja also. He is there SF of the future. Ideally their future wings are Fournier/Hezonja with Oladipo being a 6th man.