Supplier Question for SCM/Ops

Suppose that you work for a company that manufactures bicycles.  Although you make some of your own parts, you buy others.  At meeting you recently attended two managers were debating the virtues of having multiple suppliers for the brake assembly.  One manager favored having multiple suppliers and the other felt the company would be better off having a single supplier.  You are tasked with drafting a defense to both sides of this argument and making a final recommendation. Please be detailed in your response and use terms related to your learning in these areas (SCM/Ops).