Everything else is noise. If you have great developers who ship, then by definition you don't have doctrinaire methodology or "Mr Tough Guy Testalot" (I generally find "Mr No Test" to be a much bigger problem anyway). You might the situation where you have great devs but bad management, but that's next to impossible in the real world.

There's really only two steps to great software development.

1. Hire good developers.

2. Don't hire bad developers