A 4YO colt is more mature and probably more battle hardened than a 3YO colt which is why the 3YO gets about 10lbs from the older horses, but most good judges agree that the 3YO's have the better of this allowance by the end of June.
I have no real opinion here other than that Authorised looked to me like the best Derby winner for many years.

no doubt that he's by a mile the best 3YO this year and looked very impressive..but I also reckon this was a fairly weak derby judging by the standard of the other horses.
The Eclipse should be a good race but I don't get why Chapple-Hyam wants to go to the eclipse and not go for the Irish Derby. the field for this years Eclipse actually looks pretty decent and Authorised has hyet to tackle opposition of this quality.
and indeed..if it was a HU between notnowcato and authorised I'd go with authorised aswell..notnowcato is still a listed horse IMO. but...
George washington (expected to go), Dylan Thomas, Red Rocks, Sir Percy, Sixties Icon? That's a different kettle of fish.