I can't speak specifically to the McKinsey contracts.
The only thing I think I would note is that, to the credit of the open data team that publishes the proactive disclosure of contracts data, the quality of data included in the dataset really increases around 2017-18, and that's why that was the early boundary of the time period that we looked at in our research. There's scattered historical data from before that point, but it's hard for us to analyze that. Given that's when the data gets good, that's where we started.