Hayward is a SG. Ariza is a SF. Signing Ariza puts the Jazz in something like this:
Burke (30 mins a game), Exum (13 mins a game), someone else (3-5 mins a game)
Hayward (28 mins a game), Exum (10 mins a game), Burks (10 mins a game)
Ariza (30 mins a game), Hood (13-15 mins a game), Hayward (3-5 mins a game)
Favors (30 mins a game), Kanter (13-15 mins a game), FA (3-5 mins a game)
FA (25 mins a game), Kanter (13-15 mins a game), Gobert (whatever is left).
If Hayward is brought back, it probably means the end of Burks in Utah. Signing a SF has little to no effect on Burks/Hayward. Also, due to defense and running a system offense, it would not surprise me at all if Kanter's minutes drop during the season and Gobert's rise and Gobert does simple things, like running the floor, setting good, early picks, and running the offense and not Alfense.
We need to sign a backup PG, a SF and a big man.