The leading scorer from the German all-stars vs Iowa was a guy named Richard Freudenberg. He played for 1 season at St Johns and then left the team. While at St Johns he never started, and averaged 1.3 points per game. The rest of the guys are mostly German natives so its hard to tell, but if the ceiling is 1.3 points per game at St Johns, then you can kinda understand where the rest of these guys are at talent-wise
For the swiss team, I couldn't find much on any of those guys. The leading scorer Nico Brauner played like half a year of high school basketball in Michigan back in 2012 as an exchange student, and then went home?
I'd say these guys are like D3 level of talent. When they say "all stars" they aren't the best players in German professional basketball. They aren't playing in the same German league as Aaron White, for example. White plays in the highest level of German basketball...the bundesliga