2003 was Leon's (and just about the majority of the entire staff's) first year with Crown. The early knocks against crown and their visual package was that their drill or design was not up to par or the caliber of the "big boys." However, the goal of 2003 crown was not to contend for a title, but to contend for a top 12 finish. Period. Since 2003, crown and Leon (and of course the hornline et al.) have steadily raised their game to meet the talent levels of the corps and to meet the demands of a top-ranking drum corps. I think most everyone can agree that the visual package of crown 2009 is now certainly at the level of contending for a medal. Now is it clean enough to warrant a championship? We have yet to find out.
The leaning into sets, I believe, is more of an issue of cleaning up the technique; avoid shifting the body weight into the moves. The fast transitions between sets make it difficult to NOT lean into the next set, but that is nothing to do with the design. Note that I said it is difficult, but it is not impossible. For example, many corps have tons of fast and consecutive sets (e.g., HNC, cavies, PR, BD, etc.). The issue with crown, imo, is with their ability to teach to each member and to have it ingrained as second-nature the proper technique of not shifting weight and leaning into sets. I'm sure that is what the visual staff is working on, but they have yet to reach the full continuity that the other corps have. This takes a while to get down solid. Look at BD and Todd Ryan. They look spectacular in everything they do visually, and they have had the luxury of having Todd Ryan with them for so long to really ingrain the technique and philosophy of their marching/visual package.
I guess my point here is to give it some time. In the grand scheme of things, 7 years is not that long of a period. It was only 7 years ago that crown's success as a finalist corps was in question. In a few more years, just as the brass program has been able to, I'm sure that Leon and the rest of the visual staff will be able to really drive home the technique and "standard" of crown.