Obviously the sponsor disagrees with at least one justice on the court, and wishes - lacking the power to remove him - to dilute his vote. Increasing the number of justices does not change the functioning of the court, it merely effects this political end - reducing the authority of justices with whom a politiciser disagrees.
Not at all. I merely believe that the Court should be expanded to beyond three members, and I saw this as an interesting way to achieve that goal, while also enhancing the powers of the Regions. It is not at all an attempt to politicize the Court, especially given that it isn't as if the new Justices are particularly likely to share my judicial philosophy.