Sleeve shrinkage really depends on how long your sleeves are to start with.
IMO the sleeves of your Ridley are too long in the first place, meaning they stack on your wrist, that will cause a lot of creasing and shortening of the sleeve.
If you start out with a shorter sleeve that doesn't rest on your wrist you won't have all that stacking, and you won't have much if any sleeve shortening.
If anything, like you say the sleeve will actually lengthen a bit as the shoulders relax and drop.
The whole "you should order longer because sleeves shrink" hasn't applied to any of my leather jackets.
IMO this is how you end up with too long a sleeve.
Sorry for the misunderstanding. I do not say you should order significantly longer. My experience comes from my Boardracer where the sleeves ended exactly at my wrist (unzipped, naturally falling) when new. After about half a year of wear I wish they were still at this place and not shortened about 0.5-1 inch).
With my Ridley, I usualy wear the zippers at the arms unzipped so that the jacket cannot be stacked, however still creasing happened (which from my point of you looks great). It also depends on what you do with the jacket. I also use it for riding and thus prefer slightly longer arms.
PS: In general I would recommend to listen to Carlos advice - he is way more experienced in jackets than I am!
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