Darius Miller may have rightfully earned the award for the most frustrating Kentucky basketball player of the last decade.As head coach John Calipari explains it, he has the potential to be one of the best players in the country, possessing the same type of budding talent and possibilities Miller brought to UK as the state of Kentucky’s 2008 Mr. Basketball.  But through the first eight games of the 2010-11 season, Miller has played with the same inconsistencies that have defined his career at UK. At 6-foot-7, with the ability to take opponents off the dribble and the power to score in the post, Miller has shown flashes of brilliance while being compounded by lapses of production.”I just want him to be one of those guys that everybody talks about because I think he has that ability,” Calipari said after the Notre Dame game. “You know how many rebounds he had at halftime? None. Are you kidding me? ‘Well why aren’t you going after balls?’ I mean, that kind of stuff. ‘Just do it.’ “He could be as good as anybody in the country. He can shoot, he can handle it, he’s a smart kid, he’s got enough athleticism … but there is something that’s in there that’s holding him back.”In his first interview since the Notre Dame win, Miller was asked what that “something” is.”Basically just being more aggressive and more vocal on the court,” Miller said. “Coach told me there were a few times when we were down at North Carolina that I should have stepped up and gotten the team in a huddle and told them we were going to be alright.”Miller had just two points and zero shot attempts to go along with two turnovers in the first half against Notre Dame. He returned in the second half to score five points and grab five rebounds. The junior guard/forward has had similar Jekyll-and-Hyde-like performances in the two games preceding Notre Dame.Against North Carolina, Miller had three points, three rebounds and just two shots in the first half before finishing with 13 points, seven rebound and eight shots. And against Boston, Miller didn’t attempt a shot from the field in the first 20 minutes before going to the bench with two fouls. He awakened after halftime for eight points.If Miller wasn’t showing production at any point in the game it would be one thing. But the fact that he has shown signs of dominance, such as a 13-point second-half performance against Connecticut, has coaches, fans and Miller yearning for more.”There’s something that holds him back when it’s a four-point game and he can bust open the game,” Calipari said. “There’s something that makes him evaporate when we have guys out and you must step up to go do something. You take over.”An animated Calipari, nonverbally showing his frustration with the inability to put his finger on what was missing in Miller, wasn’t interested in what Miller has done when the game hasn’t been on the line.   “When you’re down 20 I really don’t care,” Calipari said. “I want to know when it’s a four-point game, because we’re going to be in many of those, who can I play and who do we go to and who can we count on.”Calipari has tried several methods with Miller to get him to produce on a more consistent basis and become more aggressive. He’s talked with Miller, encouraged him and even stopped practices to point out what he’s capable of. The latest attempt was a pair of individual meetings.”We have a lot of talented scorers and he wants me to be one of them,” Miller said. “I just have to stay aggressive throughout the entire game and not in spurts.”Before the season began, Miller said he deferred to his teammates last year a little bit too much and even hesitated on taking some shots. Miller’s scoring average has risen slightly from last season’s 6.5 points per game to 9.9 this year, but he’s on pace to shoot the ball only 51 times more than he did in 2009-10. “He’s a young man who is very much centered, good person,” Calipari said. But does that mean he’s too nice? Does he possess a killer instinct? “It’s in there,” Calipari said. “I’ve had players that I’ve said before, whenever that tiger comes out of you, whenever you understand it, you’re going to be a totally different guy. It’s hard (and) it’s physically tough.”To channel that inner tiger may just take what Calipari described as demonstrative performance. Miller won’t succeed when he’s needed the most until he inserts himself in the situation and tries to take over.”How do you build confidence in those situations? Well, you perform in those situations and you demonstrate you can do it and all of a sudden your self-esteem (rises),” Calipari said. “You have to have that kind of swagger.”Miller is by no means in Coach Cal’s doghouse, but he’d like to be move into the proverbial penthouse and live up to his coach’s expectations as one of the best players in the country.”I’m glad that (Coach Cal) has a lot of confidence in me,” Miller said. “I just need to step up my production.”He’ll try Saturday when the Cats take on border-state rival Indiana in Rupp Arena at 5:15 p.m.”I told Darius I love coaching him,” Calipari said, “but he drives me crazy.”