There are no dumb questions, only inquiring minds.
I personally would not use batting on the bottom of what I was sewing because of the lint that would get into the bobbin area. If I wanted to sew with exposed batting I would have the batting on the top. That's just me, and I'm a little bit obsessive about keeping my machine clean and oiled, at least all my friends tell me I'm a bit obsessive about it.
amh
Saskatoon sk