bathroom exhaust venting to a roof vent
As Ed said in his comment, you need to reconnect your exhaust to the roof vent. Perhaps your question should've addressed that issue. It's not clear why you made that move. 

I also agree that the insulation will probably dry out well with a little air movement. I'd place a fan blowing across the surface of the damp area, and be sure that you have good outflow. Apply a fan to a roof vent for a few days if necessary. 

The drywall isn't an issue either, unless you have visible signs of water damage or mold. Even mold on the attic side wouldn't motivate me to tear it out.