Look,
Its pretty obvious that the older horse division is pretty much gonna continute to fall far below the divisions of yesteryear.
Two glaring reasons why.
1) The Triple Crown has become a horse destroyer like nothing else in the game. Many people feel that some of the retired horses were retired for money only, but thats not the case. The injuries that these horses sustain are real injuries, and many are never the same after who don't succumb to injury. We don't get to see our best early three year olds race at 4.
2) The disproportionate money situation between breeding and racing.
You'd have to be a sheikh or eccentric to race on with a top 3 year old at age 4. The breeding deals are in the multimillions and pures money just isn't there to justify racing them on. The insurance premiums alone would be more than what a horse could earn at age 4.
Its real easy for joe six pack the fan to rant on about how these owners are all scum and should race the horse for the fan's enjoyment. Thats because Joe Six Pack has no vested interest in the horse financially. If Joe Six Pack was staring 10 million bucks in face he'd be on it like a dog on a meat truck.

Thats just how its gonna be. Unless we have a really nice gelding, a horse owned by a billionaire with a love of the game that exceeds his common sense, or a triple crown that doesn't require a horse to run 3 races totalling 31 1/2 furlongs at three different tracks in 5 weeks time, you can always count on the older horse divsion to have late developers who missed the crown, or foreign imports dominating it.
Of the horses on that list, only Sun King competed in more than one triple crown event.