I like the direction that you are taking with Seattle. I gotta say, I also like the monochrome Seattle concept as well. As for Jacksonville, I think you have enough good suggestions to work with. Some mentioned were to simplify the primary logo while having a more detailed sleeve patch. I also like the suggestion of the trident being used along with the "J" on the cap. Based on your work so far, I'm sure you will pull it off with something awesome.