A 1200m Free Handicap, I'd have to have Loving Gaby on top - when expressed in kg above WFA.
Alligator Blood v Loving Gaby over 1200m would be a good hypothetical race but AB doesn't really have the 1200m runs on the board. His four reference runs would be the Guineas Prelude win, his 2nd to Super Seth in the Guineas and his wins in the Hayes and the Australian Guineas - none of which is over 1200m. Bivouac would probably be the main contender for a 1200m free handicap.
1600m you have Super Seth, Shadow Hero, Alligator Blood, Funstar and Flit winning Group 1s.
Drop Flit, and I don't see enough evidence to differentiate between the other 4.
After today I would have Castelvecchio equal on top for a 2000m race with Shadow Hero. Even though the latter has beaten the former twice in Group 1's, the Rosehill Guineas win makes it 2-1 and there was the Cox Plate placing behind the champion Japanese horse.
Getting out to 2400m we will know more in a couple of weeks time. At this point of time the two NZ classic winners and two VRC classic winners have the runs on the board.
Today's track was extremely disappointing given the flagrant track bias.