Yet another sign on Friday night that these Celtics  may be even better and more focused than last year’s 66-win, NBA-champion group. The C’s came in after an 8 p.m. game the night before in Washington and had to battle the talented New Orleans Hornets , with James Posey  making his return and collecting his ring. After circling at midcourt and doing Ubuntu one more time with the man Doc Rivers  said understood it as well as anyone, the Celtics went out and won their 14th straight, matching their longest since March-April 1986. Rajon Rondo  didn’t have his finest game but Paul Pierce  more than picked up the slack with 28 points. Even Pose had to concede that this team may be even better than last year’s group.