5800 have only the largest 3 sprocket with an carrier.
6800 have the largest 5 sprocket with a carrier (3 in one carrier, and 2 in one carrier).
My recommendation is to torqued up the lockring as well as putting copper slip on the freehub spindle, as not having it tight enough can cause the sprocket to bite more on the alu freehubs body, and the copper slip enable easier removal when needed.
5800 have only the largest 3 sprocket with an carrier.
6800 have the largest 5 sprocket with a carrier (3 in one carrier, and 2 in one carrier).
My recommendation is to torqued up the lockring as well as putting copper slip on the freehub spindle, as not having it tight enough can cause the sprocket to bite more on the alu freehubs body, and the copper slip enable easier removal when needed.