He's mentioned consultants a lot, and has said the reason they relied heavily on consultants and contractors is because hiring or firing an MTA employee is a complicated and time-consuming process, and it's easier to hire consultants you can decide not to renew instead of risking a bad hire (that said, the way he's described the bidding process for new contracts also sounded extremely complex and time-consuming to me - I'm speculating that getting rid of a bad hire is somehow worse than that).
He's also talked about a different kind of consultant, namely a cadre of management consultants that were brought in under Andrew Cuomo to restructure the agency. He didn't like those folks very much.