What if during the migration period Dalmatia and Illyria get heavely depopulated (through war for example) and Germanic tribes/gentes (goths,gepids,langobards ...) settle in this area.
The slavs could probably move to Pannonia and seperate Germania and Dalmatia; if they do, how would Dalmatian German evolve? At the lines of the high german dialects of our timeline or would it keep the characteristica of the pre-consonant switch germanic language?
Would the switch accure at all and depending on if and where could it spread over the slavic gap to Germania/Dalmatia?