Can't say why one manual would list a sequence for removing the rocker arms and another does not but I recall on my mercedes 190sl it was important not to release one set of the camshaft fastners completely while others were still torqued down. I recall it had to do with the risk of bending something out of spec or damaging the bearing it floated on. Sort like when torquing down a cylinder head , you want to do it gradually and evenly across all head bolts.
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