Cleveland Cavaliers at 8
Unless there is someone available to the Cavaliers at 8 that they feel they must have, then it just seems entirely unlikely that they will be keeping the 8th overall pick.
The talent available isn’t likely to be a game changer, and they might prefer to add veteran talent to the roster to either supplement or make up for the loss of LeBron James.
What the Cavaliers might want to do here is entirely dependent on how they want to deal with the impending LeBron James decision: if they believe that LeBron will stay, they likely won’t want to add a rookie who could flop or be several years away from being ready, instead looking to continue to add the intelligent, veteran depth that James spoke of during the NBA Finals. If this is the case, then the Suns could offer a player or two (and presumably still the 16th pick) giving LeBron additional help right away.
But if LeBron leaves, Cleveland still might want to do something similar.
If LeBron takes his talents elsewhere, the Cavaliers are likely to want to start a complete rebuild. The 8th overall pick in 2018 is nice (again, especially if there is someone there who they believe might jump start the rebuild process right away), but so are additional picks in future years.
The Cavaliers owe the Atlanta Hawks their first round pick next year if it is outside of the top ten. Without much talent still on the roster after LeBron leaves (and especially if they trade Kevin Love), Cleveland could very well be safely in the top ten, and thus retain their pick.
However, that is a risk, and next season could essentially be entirely for naught if they end up having to give it up. The Suns could help them at least retain some opportunity for a draft pick by swapping them 8 for 16 and 31 this season, the Milwaukee pick next season, and maybe a player as well (or at least some combination of the four pieces since three picks and a player to move up eight spots is an awful lot to give up).
As a result, the Suns get a higher pick in this draft, presumably netting them someone they targeted all along, while Cleveland retains a draft pick this year, and then some insurance for next season as well.