MLB: Tigers vs Twins June 30, 2007.Tigers pitcher Andrew Miller in the first inning against the Twins. He lost in an 8-5 decision... Chuck Yadmark/ Cal Sport Media Photo via Newscom

On Friday, the Red Sox acquired former top prospect LHP Andrew Miler from the Marlins for reliever Dustin Richardson. Mere hours later, the Marlins completed their organizational purge of the Miguel Cabrera trade, letting loose Cameron Maybin to the San Diego Padres, who was also acquired along with Miller.

Miller is the epitome of a retread prospect, having been drafted sixth overall in the 2006 June Draft by the Detroit Tigers. For those who don’t quite remember, Miller was, for a time, considered the top left-hander in the draft and in contention for the first overall selection. Kansas City must have seen something in him, as he fell out of the top slot to sixth — which Detroit considered to be a miracle.

For whatever reason, Miller was never able to get his career going — managing just a 5.84 ERA and 4.70 FIP 294.1 IP out of his considerable talent.

Injuries can certainly take part of the blame, as Miller has yet to complete a full season without a disabled list stint.

But it’s difficult to blame stagnation on injuries alone. While it likely played a role, it’s anyone’s guess as to exactly what happened. It’s unfortunate, but sometimes guys just lose it. Think Craig Hansen, former closer-of-the-future who fizzled out after losing his slider in the minors. Scouts and doctors alike have posited theories from the size of the baseball’s stitches to sleep disorders. The search is ongoing.

The same seems to be happening to Miller. No one has a good answer to what — if anything — ails him. All that anyone can say is he has lost some 3-4 mph on his fastball and slider since draft day, can’t seem to find the strike zone, and needs to develop a changeup to hit the next level.

A spike in fastball velocity and a new changeup would do wonders for Miller’s career prospects. A changeup would give him a formidable combo to throw against righties while a jump in velocity would help his arsenal altogether.

But those are big ifs — ifs that have any number of obstacles standing in the way.

Whatever the case, Miller’s role with the 2011 Red Sox seems likely to be confined to low-leverage bullpen duty — if he cracks the roster at all. Out of options, he’ll have to show something in Spring Training to even make the team as a LOOGY, as he’s found a way to struggle against lefties despite having a slider as his main breaking ball.

Not what the Tigers were expecting when they drafted the lefty in 2006.

Now, 4+ years later, Miller finds himself in his third organization and a significantly faded star attached to his name.

That’s not to say Red Sox fans can’t get excited about his acquisition. Only, they should temper their expectations. At 25, he can still make something of himself, but anything more than low-leverage, cannon fodder arm in 2011 is gravy.