That makes sense, for the drag coefficient at least. I still am not seeing how mass doesn't have an affect on the actual B/C, as mass gives momentum. That is of course assuming the posters saying that mass or weight has no bearing on B/C are correct (which is a big assumption). Most every link I see on Google Fu says mass is a function of B/C.
Mass, velocity,, point of aim, and BC are all major actors in determining trajectory. But BC is separate from mass and velocity. You can think about it this way: Momentum is the "fuel" that makes a projectile go. As drag acts on the projectile, the projectile sheds momentum. The hollow aluminum shell and the solid tungsten bullet with the same shape will have the same drag. But the aluminum shell does not have much momentum, so it "gives up" in a hurry.
Wind deflection does not mostly come from the wind blowing against the side of the bullet. It happens because the bullet will very slightly "nose into" a crosswind, because that is the orientation of least resistance. So you have the drag vector pointing out of the base of the bullet, and it mostly points toward the muzzle, but slightly points toward the side. It's that component pointing toward the side that moves the bullet sideways. So bullets with higher BC are less deflected by the wind.
