Tom,
I understood your "greens within a green" concept to be internal contours acting as dividers, meaning that the green may be 9000 S.F., but have 3 3000 S.F. target areas, each separated from the other by a large ridge, tier, shelf, or valley, etc. Every course ought to have a few of these, IMHO.
They (again IMHO) work best on short approaches, where they require more accuracy, but still allow the super a large enough green to distribute both traffic and ball marks expected from short iron approaches. But, they can work elsewhere, as well.
Incidentally, I was surprised to see this concept used frequently at Oakmont, in very rigid fashion on many greens, but especially 9 and 18, when I played there earlier this year. The straightness of the dividing valleys struck me as perhaps being influenced by CB McDonald, but maybe thats as creative as they were in those days....in any event, I now know why Oakmonts greens have the reputation they do!
I didn't imagine your concept as "over the top" but will allow that many good players prefer a gently rolling green throughout, feeling that a dividing ridge may deflect a shot proportionally further from the hole if they "just miss" the target area. On a gently rolling green, a miss by 20 feet ends up 20 feet away (plus or minus) a miss by 40 feet usually ends up 40 feet away, etc. on a "standard green."
It seems to me, that in many ways, the divided, compartment greens really increase accuracy demand, but not necessarily the strategy of interrelateds shots. Basically, if one of the compartments is guarded better, the choice is to I dare to go for that, or do I accept a longer putt through a valley while playing my approach safely away from the bunker. But, that strategy would probably be in play whether the green was gently rolling or tiered, etc.
I offered the sloping green as another way to create tee to green strategy, and I think you have a similar image to what I was trying to describe.
I have done research at various courses during remodels where members say "this green just won't hold." I measured slopes and found that an upslope of at least 1.4% is necessary for averge/good club players to stop and drop it. Less than that, they roll off the back. Oddly, I would have thought it might be 2.4% for long irons, proportionally rising, and it may be, but it doesn't seem to be true from my limited research.
My point is, I was envisioning a green canted about 20-30 degrees to the right, with a bunker front right (or not) and the basic slope going to the front left. The player approaching from the left would have more depth, because of the angle, an upslope of 2% or more, and a frontal opening.
Approaching from the right, the player would have less depth, perhaps a frontal hazard (sand, grass bank, whatever, requiring a carry) and a green level, or perhaps sloping away from him, which wouldn't hold a shot as well. He would need to hit a high fade for sure.
That the player from the right would simply have more trouble holding the green, compared to one coming from the left, especially if there is a bunker front right. So, the green design really dictates going left. I don't know exactly what hazard would go left to punish. It could be fairway.
Many designs would raise the left of the green, helping the shot from the right "to be fair" to anyone hitting over there, and more closely "equalizing" the value of the two options. That would be okay, too. The land would dictate how I treated the green design, together with a balance of the other holes on the course.
As a last option, I think the green contours can set up shots, if you have "spikes" or gently rolling rigdes on the side of the greens that allow a player to use them to feed the ball down to a particular pin location.
What was your question again?