There are a ton of factors that go into signing a player. Teams have to ask themselves if a player is financially feasibly, would mesh with and help the team, is healthy and interested. While there are interviews and meetings, team’s also send other players to recruit.
When Russell and Sullinger decided to work out together, the chances of it being a recruiting pitch were high. They were even working out in the Nets facility.
Everything points towards Sullinger signing a deal with the Nets. Everything but the fact that there’s a possibility he would not help the team.