Let me make this simple. Linden Blvd is essentially a small highway for Central Brooklyn. There is no NEED for a freaking route, especially one all the way from Downtown Brooklyn. And yes, it would be redundant, because if you haven't noticed, Linden Blvd is a block away from Church Avenue.
Quit with the wet dreams.
This is a moot point, because the B43 and B44 serve two completely different ridership bases, and the B48 isn't doing that well to begin with, so you are really grasping at straws here.
If you don't know what the f**k your talking about, don't make proposals for the area. Plain and simple.