Oh, sorry I forgot that part. I am certainly no expert but actually in the late war they apparently did. BFC has the research tucked away - I didn't do the research my self. My understanding is that they decided that instead of spreading them out all over in little drabs they would concentrate the weapon into their own platoons. The plan was to replace the squads built around rifles and MG42s with squads built around everyone having the MP44. They clearly never had enough to do that for the whole army. Plus someone said they also decided that ditching the MG42s was not a good idea and modified their roll out. So, there might be platoons with all MP44s and MP44s and MG42s - if not now then in later time frames.
