It’s way too early to start the clock on when Devin Harris becomes the Dallas Mavericks’ starting point guard. Rick Carlisle doesn’t deal in knee-jerk reactions like that. However, given the way the wily veteran has played the last two games, including a superb showing off the bench in the Mavericks’ 116-106 victory over the Detroit Pistons on Sunday night, the possibility of Harris being a go-to point guard for them at some point certainly is blipping on the radar. If nothing else, he showed Sunday he’s a capable finisher, regardless of whether he’s a starter or not. Harris had 14 points and seven assists in 24 minutes of playing time against the Pistons as the Mavericks started a four-game stand at American Airlines Center on a positive note, stopping their season-high-tying two-game losing streak. The Mavericks were met with only modest resistance by the Pistons, shooting nearly 58 percent for the game and running away from the visitors after scoring the first 10 points of the fourth quarter for a 13-point lead. Harris was on the floor all of the time when the Mavericks pulled away. This came after a loss Friday at Brooklyn in which Harris had 14 points and four assists. “He’s been going better and better each game,” coach Rick Carlisle said. “He’s getting more rhythm and more feel. On a night when Monta (Ellis) couldn’t get it going, it was a Godsend to have a guy like Devin. “And he’s smart. He knows what we need.” That last point cannot be overstated. Harris had a major surgery on his left foot and missed the first 41 games. He’s been back for five. What he’s shown is that he provides something defensively that Ellis and Jose Calderon lack. And he’s also much like the two starters in that he can play both positions in the backcourt. As a trio, the potential is obvious. Finding how each of them fits together will be the challenge for the players and the coaching staff. “I do believe so,” Harris said when asked if the Mavericks have three hybrid guards rather than specific point and shooting guards. “The way we can use Jose, along with myself and Monta with the spacing, any one of us can be effective (at either position in the backcourt).”