It's Guiseppe that is the lazy one. Andreas is the big-but-not-too-smart one. 
Also, Guiseppe still only has a limited knowledge of Low German (score of 2), so having him lead the team is going to be problematic. Though that and his laziness would explain the slow pace of progress. 
I want to post something about the various levels of knowledge in languages work, so that this can be role-played reasonably well.