Lot of good comments here. @bishop8950 is spot on. I don't think the ideal set of movements, from centerline to apex, are as complicated as many tend to think.
There is undoubtedly 1 " most efficient" set of moves that gets you from centerline to apex better than any other combination of moves.
I don't know precisely how many "moves" there are in the sequence, or what all the right ones are.
The physical fitness and flexibility/mobility of a skier definitely plays a role in how and what that skier can do, on a ski. But that doesn't mean every skier shouldn't be working towards the same goal (skiing the most efficient lines and passes), and thus, be trying to execute pretty much the same moves....with one exception: if you can't get your body into the best anatomical shape, at the appropriate time throughout the course....at the very least you should understand what the ideal body shape is, at that point in the course, and learn how to maximize what you can do within your limited range of motion.
We all do this...sometimes its for the better, sometimes not.
For instance, many people either ski with really restrictive boots, have their feet mounted too far apart, or have really poor ankle flexibility: so to make up for their inability to move their knees forward on the ski, they tend to bring their shoulders and chest forward. This is a very common adaptation on the water. Its their band-aid for not being able to use the most anatomically (and efficient) body position to move their center of mass. Instead, they do what they can in the moment, and it becomes a part of their "style".
Terry has developed an adaptation in his transition. Sometimes he overloads the rope on his cut into the wakes....usually not, but sometimes. The harder the load, the harder it is to manage the unload outbound. As result, Whisper gets popped to the inside quicker than he would like...along with 99.9999% of the skiing population (although Terry handles it better than most). If he were to keep his arms long when he pops to the inside, the rope would go slack momentarily. So, he's learned to manage that change in rope load by pulling his elbows into his sides. Its a result of something else, its not his goal, nor his focus.
Which highlights one of my biggest frustrations with the technical culture surrounding water skiing, and happens to be exactly what @bishop8950 was getting at. Analyzing the best of the best is a delicate and dangerous thing. Most people don't know what they are looking for, and therefore often make the wrong conclusions. The anecdotal approach of "it works for the best, so it should work for me", is where we came from...back in the 1970's, 80's and 90's. Its grabbing straws and hoping we get lucky. I think BOS has played a huge role in elevating the level of dialogue surrounding technical aspects of water skiing....by providing this arena for some of the most passionate skiers and greatest minds to share ideas openly and freely. @horton deserves about a million Anti-Panda's for all he has done to move this facet of sport forward.
I'm just hoping that folks continue to think outside the box, critically and creatively. I think a lot of you out there have great ideas, and maybe a slightly different approach or vision than the next guy. That's what it takes to keep things fresh and spark new ideas. But at the root of it all, the foundation of everything we are talking about, is physics.
The better a skier understands the forces that are acting on he/she, the better they will ski. Learn to love that aspect of skiing, like a lot of the guys on this forum, and you will ski better.
2 final thoughts:
1. Pulling your arms in through the transition is bad. I promise you will ski better if you can resist the urge to pull your body closer to the handle.
2. @skijay and others have mentioned moving the ski/hips/feet/etc outbound and wide as possible through the transition. This is a common misconception as well, but this should never be the goal. Maximum width at apex doesn't come from projecting or shooting or pointing your ski outbound....it comes from riding the handle outbound as long as possible. I'm pretty confident that to improve your skiing, you should try to do the opposite: Slow the outbound movement of your feet ( @horton and his flat ski technique is genius) and keep your hips as close to the handle, as long as you can, through the transition.