But even then, the Defiant having a dedication plaque in the same spot as Enterprise is a retcon as it didn't have a plaque in The Tholian Web.
Are you sure? Here's is a screenshot of the Defiant's bridge from The Tholian Web. I got it from the TrekCore archives. You can see the plaque in the same place as the one on the Enterprise bridge, although you can't make out what it says.