Are you sure Carlton hadn't made it clear to other clubs that Yarran would likely be on the trade table.Of course he had a shit season, he had your club in his ear for most of the year priming him for defection. Bit rich to use that as a reason to devalue him.
That's like creeping into a car yard at night, slashing a car's tyres, then coming back the next day and telling the salesman you deserve to get the car on the cheap due to it having 4 flats.
I dont know myself but there has been no complaints by Carlton about us tapping up a required contracted player, I can only assume that any discussions may have been with the full backing of Carlton.