You could be right. This could be a very rare year which would include 7 WRs (with Slater), although I'd have a very hard time imagining a total of 27 offensive players myself. To be honest though, I don't really see 7 WRs. As a matter of fact, I'm not sure how often it's even been the norm to keep 6 lately, although that likely had a lot to do with the 2 TE heavy sets.
Yeah, I would have a very difficult time imagining only 23 on defense--especially when I believe that we'll keep at least one more in both the front seven + possibly the secondary.
Of course we'll be able to carry 54 for the first month until Browner returns from suspension, so it's quite possible that someone will be axed once he comes back.