Another side-by-side solve, and as such, it went down fairly easily. Got TWOWAY/STREET (5D: With 6-Down, mutual relationship) very quickly, and then we knew what to expect for the rest of the grid. As we were doing it, I felt that the theme was very thin. It seemed like there were only four short theme-related answers, but really, there are eight, plus the 15-letter revealer, AND, four of the answers are upside-down, so I think I have to reconsider my complaint of "not much theme for a Thursday." As I look more and more at it, it's really quite slick.
Neither of us could believe it when PIEHOLE (28A: Trap) started to come into focus. Both the answer and clue are great. (Huygens, maybe this kind of thing will get Sue more interested?) And off of that, LOCAL (30D: What pulls out all the stops?) was another good clue. As was the clue for RENEWED (15A: Bought more Time?). For "18A: One-third of a French revolutionary's cry," (EGALITE) we both frantically counted out the letters of each word, only to realize that we could only put in the "té" at first, then had to wait for more crosses.
When Frannie saw Rubens mentioned in 21A: Like the women in a famous Rubens painting (SABINE), she immediately threw out "zaftig" as an option. I had never heard that, but it would have fit, and it could have been appropriate. More my speed were the dual "QB" questions, but I couldn't think of either Jim MORA (32A: Either of two N.F.L. coaches named Jim) for the life of me. Sigh.
Funny about 45A: What the Beatles had but Wings didn't? (ARTICLE), eh? But then why, if it's part of the name, don't they capitalize "The" in "The Beatles?" Because it's not really a part of the name, right? But then how can they be said to "have" it? Just because you have to use it when talking about them? Ugh. I'm just confusing myself needlessly, I fear.
Lastly, the clue "49A: Flotsam or Jetsam in "The Little Mermaid" was so novel that we didn't even really notice that it was our old favorite crosswordese, EEL!