They told me the same thing when I made a reservation for 8. I don't like eating outside (in June) in the heat, so I requested 2 tables for 4 people inside. They said that we could do that, so if you don't mind splitting-up you could sit inside.
We've never eaten there, so I can't help you with your question. Sorry.
We have eaten outside at WGP, by choice. It is covered and it was lots of fun--until the torrential sideways rain!! We were moved to the inner outside tables--against the building, not the rail. We enjoyed our meal and watching people dash through the rain from that vantage point as well.