Yes, the individual players can make a configuration in the lobby that is wider than what a “narrow group” would be.
If nothing better is available, or what not.
But what blizzard has only said, is that wide groups will not be matched against solos or narrow groups.
Consider also that in higher ranks the definition of a “narrow group” also is tighter than in lower ranks.
Since last patch,
- Grand Master can now group within 3 divisions to be considered a narrow group.
- Champion can now group within 1 division to be considered a narrow group.
If the narrow/wide restrctions applied on to how a whole lobby could be formed, the champion games would be next to impossible to set up because anyone could be at most 1 division apart from one another.
If you were champion 4- good luck finding 9 players who are champion 4 - champion 5.