4. As everyone mentioned- tough as nails. Kevin's diagrams notwithstanding- I still think if you consider just the upper fairway as the legit playing corridor it's too narrow for this beastly a hole. You have to carry the center rough before it gets wide. Shame the lower fairway couldn't have been 10 yards wider where you could aim there and have a better angle into the green. Risking the chasm would be a cool risk/reward option. Also think the area short of the green repels balls more down the hill than onto the green (especially coming in from the left side of the fairway) leaving a lot of pitches. Safe but not as nifty as if playing there to bounce on. Most times I've played it has to be a hot low runner to defeat the slope.
"Kevin's Diagrams?" - you mean the photo image of the actual width? How manipulative of me.
I suppose this comes back to the "What is a Wide Fairway" debate. Looking at the other threads, Tom Doak thought that anything under 35 is narrow, 45 and up is wide. So just considering the upper fairway, you still have a "wide" fairway, but you only see 25 yards of it. In this case, I think it plays even a little wider than the actual distance, because the left side of the fairway is sloped and will send pulled tee shots back to the fairway. And on the right, there's still 30 or so yards before you reach the ravine (plus the "arrester" rough). If you're in the left rough anywhere past the first tier drop, it's not that the fairway wasn't wide enough - it's simply that you drove through the fairway (more an issue from the Ridge tees than the Ballyhack tees).
Even our esteemed George Cup Champion Tommy Williamsen is quoted as saying "I hit the tee ball relatively straight and like fairways that require accuracy. Anything over 40 yards is wide." So, this hole must be all mental for Tommy, since he's given a wide fairway (45+) and a downhill approach that favors his Sweet Tea draw. Tommy should own this hole (and often does, because I recall a 5 foot birdie attempt the last time I played it with him). (No fee for that bit of mental coaching, Tommy. That's a George Cup Champion to Champion courtesy).
It's interesting that you mention playing down the right split fairway as giving a better angle. It must just be me, because I much prefer approaching this hole from the left side vs. being close to the ravine. On the approach, the "death miss" for me is in the left greenside sand, as there is just so much potential for awkward stances and horrendous lies (I could discuss this more, but I don't want to steal Jim Sherma's thunder about some of the bunker features). As a result, I would rather approach from the left side feeling like I'm shooting away from that trouble than coming in from the right. To me, it's like having OB left on a hole - I'll tee up on the left side of the box every time. Plus, from the left side, the slope of the green acts as a backstop. From the right, I think of it as something that will kick me to the left. Also, if I recall correctly, the lies on the right side tend to be above my feet, which may promote a pull. Funny how different people are in approach angle preference.
But even if the right sliver of lower fairway was much wider to make this a true split-fairway hole, I still don't think it would be a preferable route. Even assuming you prefer that angle, I think you would still want to hit your approach from an elevated fairway vs a lower one (per Google Earth, the upper fairway is 18-20 feet higher). Plus, just missing the right fairway would be in a ravine, while just missing left on the upper fairway has a built-in safety slope pushing you back towards the fairway.
As for the area short of the green, you are correct that it will repel certain ball flights rather than bound them onto the green. But I actually think that's better. It makes that slope play as a "shot option" rather than a "forgiveness feature." For example, at one of my local courses, the green fronts are open. But if I attempt an aerial approach and catch it heavy, I may still bounce onto the green ("forgiveness"). But in Ballyhack's case, you still need to have some "intent" to hit a runner in order to benefit from the slope. At the last George Cup, I had a great drive and 135 in. I came under my 9 iron a little, landed about 10 feet short and the ball hit weakly, ultimately falling back down the slope a good 15 yards (which is what I deserved). But if I'd tried flighting a 7 iron, and hit the same spot, it would have bounced forward onto the green.
The amount of discussion and potential controversy around number 4 tells me it's one of the best holes there. It strikes me as a hole where some may say "there's too much going on." I've heard that used a criticism of holes before, and generally never understood why that may be considered a bad thing. Why wouldn't we want multiple things to consider on a hole? On this one, you have a diagonal landing area, the need to overcome visual confusion, the need to consider the roll-out of your tee shot if you can crest the hill, three different "target tiers", plus aerial and ground approach options. This hole has grown on me quite a bit over the last several visits.
Finally, it passes one of my favorite indicators of greatness. Have you seen a hole similar to it anywhere else?