Yes, Bar, but given he'd have the 3 year old allowance, where would Camelot finish if all those horses you mention ran to their ratings?
The allowance is built into the ratings.
There is no chance of all the horses Bar mentioned running to their ratings. The history of the Arc is choc full of horses running below their best due to heavy summer campaigns.
I wrote a piece on betting.betfair after the Arc Trials, these were the top Timeform weight-adjusted ratings.
Timeform adjusted ratings for Prix de l'Arc de Triomphe
143 - Danedream
140 - Orfevre, Snow Fairy
138 - Nathaniel
137 - Camelot, St Nicholas Abbey, Sea Moon
3yos also tend to improve on their best previous rating in the Arc (STS the exception), so 128 going into the race for a 3yo would almost certainly see a placed effort and have a good chance of winning.
Zarkava had your typical Arc prep
Rail Link and Hurricane Run. See Zarkava
if he runs again - anywhere - doubters, watch out.
Joseph won't ride him if he's in against older horses because of WFA he won't be able to do the weight.
if Lester from 25 years ago rode him he wouldn't win it..imo.
If he'd had a nice gentle run in the Prix Niel rather than a hard race in the Leger and if Orfevre wasn't in the race I'd give him half a chance. But like SNA and So You Think and High Chaparral and Duke of Marmalade before him he's hardly had the prep for it. Unless he has the constitution of Dylan Thomas he has no chance.
If he'd had a nice gentle run in the Prix Niel rather than a hard race in the Leger.
So what? How can you be sure he won't step up to the mark at Longchamp?
As for constituion, I think winning a Guineas and Derby suggests he has a fair bit of that.