Sandhurst is the army Staff College they had to let them land or they don't get to game anything

. (repeating What if above)
are probably larger than the entire KM

.
Be fair, at this point the entire KM has about two units above destroyer that can be relied on to both know how their ship works and take it out of the docks without lots of water coming in. Everything else is either small (about ten DDs and some torpedo boats of various sizes), broken (the Scharnhorst springs to mind) or not yet completed (Bismarck's crew are still not sure how these big AA gun things work, AIUI).
So yes, there's probably several commands which are larger than the KM's fleet units. Heck, HMS Revenge (HMS sacrifical battleship)weighed 30,000 tons, so the remaining KM DDs as of 10 September:
1 1934 at 3,100 t
8 1934A at 2,200 t
1 1936 at 2,800 t
are actually outmassed by HMS Revenge alone.
Yes, in order to outweigh just
one of the ships slated to oppose the invasion, the Germans need to pull together their operational heavy cruiser (the Scheer) and all ten DDs.