I've never had any interaction with McKinsey in terms of Brampton Transit's partnership with the Canada Infrastructure Bank.
The only time I've ever met McKinsey was when Alykhan Velshi worked there. He worked for Prime Minister Harper, and then moved on to McKinsey. When I was in the provincial arena, we did some work with Alykhan Velshi. I wouldn't say I did not have a positive impression, and I would note he's gone on to work for Huawei and the Chinese government.
That's the only person from McKinsey I've ever met, and it had no relation to Brampton Transit.