Cosmas,
On the surface, there's nothing wrong with using the name of a long-dead Bishop of the area. HOWEVER, looking at it from a conspiratorial perspective (which is prudent, considering the circuмstances), I see this as a psychological change, meant to 'connect' St Mary's with the diocese, of which the old Bishop was part of. It's meant to make St Mary's 'normal', as can be, and to break down the barriers in thinking of 'trads' vs 'conciliar'. It may seem insignificant, but it's not.
Christ told us to separate ourselves from the world, so far as we can. Trads need to do the same in regards to the new church. It's not bad to be an 'isolationist' catholic; in this day and age, it's necessary to keep one's faith...especially for school kids who are naturally trustful. They need to be warned of 'wolves in sheep's clothing', not taught that they have some connection to the diocese.