The reason guys don't always OPS 1.000 in rehab/demotion cases is the same reason they were rehabbing/demoted in the first place.
You can argue Lars is closer to the majors since he isn't blocked by Butler, Jacobs, Shealy, etc. As soon as Lars is ready, there's a warm spot at 1B/DH in Boston waiting for him.
If you can't understand the difference between a 20 year old putting up huge numbers in AA and a 24 year old finally reaching AAA and mashing after 2.5 seasons in AA, than just give up on analyzing prospects.
Lars Anderson's AA numbers were nowhere near Kila's last year. As well as the fact that Lars' were over a much smaller sample size. I'm not going to bother figuring his BABIP but I'll tell you it was extremely high last year. As you can see by the regression in his numbers even though he has improved his contact rate this year, he was damn lucky last year. Kila's numbers in AAA are down some but they are still very good. Kila has the skillset and maturity for an easy transition into the majors. Lars is at best a year and a September call up (more than likely 2+ years) away from rookie struggles in the majors.
Shealy is not blocking Kila, at all. Jacobs and Butler are both on one year deals. So this means a few things. Jacobs or Kila more than likely get traded at the trade deadline or Jacobs just does not get resigned at the end of the year. Lars is still a ways from the MLB. Yeah he could probably be rushed, but I would hope he isn't for his sake. Check out Daric Barton very similar case scenario Billy Beane rarely miss handles a prospect but Barton has been set back badly from the way Oakland handled him.
ZOMG-One guy who was rushed sucked when he got to the majors. How about Justin Upton, Joe Mauer, Gary Sheffield, etc. There are numerous examples of guys failing or succeeding after being rushed. Similarly, there are numerous guys who have failed or succeeded after spending too much time in the minors. Why? Tons of guys try and make the majors and many fail.
Last year Kila was 24, Lars was 20. Until you understand what that means, just give up. I'm also curious how you quantify "skillset and maturity for an easy transition into the majors."
BABIP with no history is a very poor choice of stat to try and deduce a hitter being lucky.
Butler is under Royals control for 4 more seasons. He may not even be arb eligible after this season depending on what the Super 2 cutoff is. Jacobs has 2 more arb seasons with the Royals. These 2 are blocking Kila. There's no reason to think Lars won't compete for a DH/1B spot to open 2010.