This doesn't answer that question but I find it interesting that one of the more successful sons of Man O' War is War Relic, who seems to follow that pattern. I also don't think he looked a lot like MOW or passed on that shoulder or high neck set.
However, via bloodlines from Fair Play and Rock Sand, he carries a lot of Rock Sand and Fairy Gold. WR is by MOW, who is by Fair Play by Hastings out of Fairy Gold.
MOW's dam, Mahubah, is by Rock Sand.
War Relic's dam, Friar's Carse, if by Friar Rock, by Rock Sand out of Fairy Gold.
I'm thinking it was that intense blood that allowed him to carry on, at least as a broodmare sire and to some extent, sire of sires.
War Admiral, on the other hand, looks more like MOW through the head and neck, at least to me, and certainly ran more like him. However, he was a bit of an out cross, if I'm using that term correctly. His dam, via Ben Brush, did carry a cross of Australian and West Australian way back there, but that's about it. I have not looked much further back.
I think that although the cross on the Domino-bred mares was successful, I don't think it was the best way to keep the MOW line alive. I wonder what would have been if they had bred back to the West Australian line more, with a little more of the Hampton thrown in? Or did they think along those lines back then? I know the Domino got doubled up on a lot but there were so few of them to begin with. It would have seemed worth the risk to say, cross a War Admiral on a daughter or grand daughter of MOW.
I'll always wonder what if it had been War Glory or American Flag who carried the male line on?
Ooops, is this the site you're referring to:
http://www.highflyer.supanet.com/
(Scroll down, other stuff, too)