Butler signs a one-year, non-guaranteed deal and the Wizards waive three others vying for the final spot.
Otto Porter Jr. scores 22 points in the Wizards' preseason finale against the Knicks.
The Wizards shot 51.4 percent from the field, but recorded 21 turnovers to 18 assists in a 103-100 defeat.
Wittman thinks it would be tough to compare LeBrons and Jordans of different eras if game lengths are changed.
Sidelined since slicing his hand in the Wizards' preseason opener, Humphries could help fill out a depleted roster.
The journeyman point guard played in 42 games for the Utah Jazz last season.
The Pelicans built a 29-point lead in the third quarter.
John Wall is expected to practice Tuesday, but he was held out Monday night with the same injury that bothered him during his rookie season.
Guard sprained his right ankle Wednesday against Maccabi Haifa.
Pierce limped off the court at the end of the second quarter but returned after halftime.