If Dunleavy's back is healthy, you're going to see the Cavs go to LBJ, three wings, and Frye as the bench lineup. Mo and Felder weren't/aren't going to see minutes in such games.
In game 3 of the finals, the Cavs started the 4th with LBJ/JR/Shump/Jefferson/Frye and that lineup killed +100 per 100 possessions lol). Replace JR with Dunleavy in this situation since in regular season games, JR will get rest.
Delly/Shump/Jefferson/LBJ/Frye was one of he best lineups in the NBA last year (+34 per 100 possessions) and was better than our starting lineups with Kyrie and Love. I won't go into how much I love Delly and his impact, but we can replicate some of this lineup with Dunleavy's shooting. The only thing missing is Delly running the pick and roll with LBJ which was dominant.
I can see these lineups:
Kyrie/JR/Dunleavy/LBJ/TT or Frye or Love
Kyrie/Shump/Dunleavy/LBJ/TT or Frye or Love
LBJ/Shump/JR/Dunleavy/TT or Love or Frye
LBJ/Shump/Jefferson/Dunleavy/TT or Love or Frye
If Dunleavy is healthy, I'm willing to bet we see some of our best +/- lineups with him in there.
This is how he affected the game when he was healthy two years ago. Doubt he gets back to this,my it even if he's half of this:
He was 10th among all SFs in DRPM last season at 2.17 and 11th two years ago at 1.91 so it's no fluke. He was also one of only 18 players who was at least +1 in ORPM and +2 in DRPM(LeBron, AD, Kwahi, Draymond G., Danny G., Milsap, Pachulia, Tyson Chandler, Zach Randolph, Hayward, DeAndre Jordan, Wes Matthews, Derrick Favors, Cody Zeller).
The Bulls were 3.8 points per 100 possessions better with him on court. In the playoffs, they were 17.2 points per 100 possessions better with him on court. In his 13 seasons in the NBA, his teams have been better with him on court than off 10 times. In the playoff series against the Cavs, he was +1 while on court for 227 minutes and the Bulls were a total of 26 points better with him on the court than when he was off court.
Dunleavy was top 19% in the league in spot up PPP at 1.10. For reference, JR Smith was top 4% at 1.23 PPP, Kyrie was top 9% at 1.17 PPP, and KLove was top 15% at 1.12 PPP. He shot 45% on corner threes, 65% in the playoffs.
His spot up defense wasn't great as he allowed 1.03 PPP, bottom 35%.
His ISO defense was really good. He allowed .67 PPP in ISO, 14th best among players who played 60+ ISO defensive possessions/
He was pretty good defending off of screens. He allowed .83 PPP, good for top 40% in the league. He was decent in defending the pick and roll ball handler, top 48%.
Overall, he was a two way player (could still be though doubtful) who knows his role and would give us another plus player in the rotation and make the team stronger. In addition, we won't have to see him make annoying 27 footers against us which he seemed to do all the time. When he plays with LBJ, he'll get open looks.