There is no issue at all with aluminum crimps. As far as holding power long aluminum crimps the type very commonly used in fishing are far superior. First aluminum is soft and more malleable than copper which, is brittle, will crack and cut line. Second, in no way shape or fashion will crimps cause a shaft to rust to the point of damage.
....as far as i remember the content of this thread, nobody here had concerns about the crimps will cause damage to a shaft.
but some mentioned and proved that it is possible that a crimp, most of all aluminium-crimps, can face corrosion and damage through contact with stainless-steel components, wich could be the shaft or the cable used.