That is typically a good way to clean up a mesh. :) Models also have a Drawing Overrides section in the attribute editor for both the transform and shape nodes, this was probably set to Template mode. Something to check out if you run into this again later.
for anyone interested. not sure if its the best solution but in the end i combined each mesh with a cube. after that i deleted those in component mode and deleted the history of the objects to get rid of the ktransforms appearing in the outliner. Hope i don't get into trouble because of that later on.. ^^I´ll let u guys…