Dynamic queue fill is almost always support
It's as the title above says, I'm not sure if that happens for everyone else, but whenever I use the fill role in dynamic queue, I get support. I don't really mind too much, since I do fill, I don't mind playing any role, but there is no variety when I use the fill role because I always get support.
Basically, I hope that fill is not so inclined towards support, because I would like to be able to pick fill without expecting to be support.