There are no Mexican car makers nor are there any Canadian car makers.  The car makers in Mexico are American, German and Japanese, in Canada they are American and Japanese. Those countries are where  the management jobs are, they are where the decisions are made.  Canada and Mexico 's role in auto manufacturing is the same: to supply labor, Canada competes directly with Mexico in that regard.  Mexico's competitive advantage is low wages, Canada's is a weak currency and government provided healthcare. 

The liberals may give Dias an important role just to cover themselves, given that the country's only interest in this is the jobs, not the business. If Bombardier goes to the government for help, the national interest is at stake at all levels of the company (workers, management, owners, lenders),  with automotive its only the workers.  The Americans are our biggest trading partner, Canada is an important market, they won't forget that in the negotiations. Dias' bluster means little.