It fits really well into agile because they deal with different aspects. For me it's just a way to empower my team and keep them unblocked to do what they need to do. It starts with trust and goes from there. If you know your team, you trust them and they're the right people in the right seats you know you're heading in the right direction. We've created a culture where they manage me (meaning they tell me what they need from me not the other way around) and they're accountable to each other not to me (if the DBA needs time off, he makes sure his team mates have what they need - it doesn't effect me except for tracking outputs and if I'm setting them up with what they need then this is already handled anyway). If you use some of these concepts properly success will become a side effect of having an efficient and happy team.