on introducing disruption in the team...

When you are looking to make changes in your team, you have to be mindful about how much disruption you are introducing deliberately.  Sometimes you don't have a choice - external factors introduce.  But when you do have a choice, you have to be careful about the areas getting disrupted, how much, and when.  It is also important to consider the ability of the team under the leaders.  You should also assess how your direct leaders are in collaborating with other parts of the organization.  As a CFO, it isn't just the ability of your leaders to do their functional jobs, it's also about their ability to do their organizational roles - extensions of the CFO.