The detail from the selection that effectively helps to develop the key idea that the Wars of the Roses were due to the conflicting claims to the English throne is However, the English kingdom devolved into chaos under Henry VI and the king's council, a group of aristocrats in charge of the kingdom's management" (lines 9-11).
The central idea is the main element in the story that unifies the story. In this case, it's the main idea in the story that the author wants the readers to know.
Since the key idea, in this case is about conflict, the lines that illustrate this is when the English kingdom devolved into chaos under Henry VI .
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