Canelo Alvarez vs. Juan Manuel Marquez, your thoughts?

I am wondering why Oscar de la Hoya's GBP offered Canelo Alvarez to JMM as his opponent when he can offer Victor Ortiz. I doubt if Canelo can make even 147#. If they want to keep JMM, why they have to offer Alvarez as a counter offer to the offer of TR, a triology between JMM and Manny. Why not Victor Ortiz who is a much smaller fighter than Canelo.