The lesson
If buyers are weighing build against buy, give that decision its own section in the case study and let the customer argue it.
The headline reads "HOW ATLASSIAN'S BUILD VS BUY DECISION DROVE AN 820% BOOST IN MEDDPICC USE", with Challenge and Outcome blurbs below. After a section on the coaching bottleneck, "Build-vs-buy: Which was the clear winner?" carries a pull quote from Atlassian's Principal Product Manager. Later, a Goal, Capability and Proof point table summarizes results.
Don't copy the 820% headline unless your customer will confirm the number in writing. Keep the section that names the alternative the buyer is considering and quotes the customer on why they chose differently.