Davis' salary will roughly be 25.4, meaning we would need to get to roughly 20.4 in salary to trade for him.
Morris, Rozier, and Tatum all have significant raises in their salary into the off-season. Morris will be just over 5.5 million, Rozier just over 3 million, and Tatum just over 6.7 million. A combination of Yabusele, Ojeyle, and Nader plus the above players would be enough. However, 6 for 1 trades are pretty rare and unlikely.
In the end, trading for Davis without giving up Kyrie, Hayward, or Horford would hinge on a sign-and-trade with Marcus Smart. If his contract was the MLE (8.4), then Smart, Tatum, and Morris would be enough salary to get it done (but would it be enough talent to get it done?). I can't imagine Smart being too thrilled to agree to a sign-and-trade, unless he got significantly more than the open market offered. In other words, for him to agree, he'd probably need to be around 12-15 million a year, but would the Pelicans be willing to do that? Probably not.
There is another big problem, however. Anthony Davis has an estimated 15% trade kicker. He would need to waive that in order for the Cs to trade with him.
Another possibility is, if we are able to get the Lakers pick (big IF), then we draft a player, sign him, and they trade him in combination with Morris, Tatum, Rozier, and Nader. This is what happened a few years ago with the Wiggins-Love trade.
Obviously it'd be great to get Davis, but I am perfectly content with not getting him. I think the Kyrie-Brown-Hayward-Tatum-Horford core can win it all.