A couple of points, if I may...
The comparison over 12f was because I've been taken to task over at FF suggesting SB could arguably have given STS 7lbs and a beating on their Arc form.
I have no doubt the STS we saw in France wasn't the STS we saw at Sandown and I have no doubt SB's Arc was far stronger in depth. Can anyone really imagine Youmie getting within two lengths of Reliance, let alone SB?
If you believe STS had more gears than SB, check the various Youtube clips of the latter in action. While it's possible he (STS) did, it's hard not to be taken aback by SB's cruising speed. I couldn't envisage even STS getting SB off the bit in the middle stages of a race.
I'm glad you mentioned DM. He was a super horse too, and his DWC win and his demolition of Sendawar at Ascot will live long in the memory.
I will remember STS as the champion of his era and a great one at that but even though I was just about to turn 10 when he won his Derby and was just past that birthday when he won his Arc and therefore can't remember him much, every time I try to analyse SB's form I find myself likening him to Arkle, which is going some.
It should pain me to accept he was better than Brigadier Gerard because he was the superstar of my teen years but it doesn't. There's no pain in accepting that something is just so good as to be almost unbelievable. It's to be treasured.