Many of the elements of a typical Mikhail D. Prokhorov news conference were on display on Monday: the deadpan humor, the rhetorical showboating, the stubborn optimism and the incongruous talk of N.B.A. championships.
But one day after completing a major shake-up of the Nets — firing Coach Lionel Hollins and demoting General Manager Billy King — Prokhorov, who has owned the team since 2010, also put forth a somewhat uncharacteristic show of humility, accepting full responsibility for the sorry state of the team and describing himself as chastened by the complexities of running a winning club in New York.