When Nightengale is on Buster’s podcast, it is pretty obvious that Buster has very high regard for Nightengale and his insights. Not just that he has Nightengale on the show periodically, but also the tone from Buster. My perspective is that Nightengale still among the best.
All I know is that I've unfollowed him on Twitter several times over the years because he occasionally reports transactions as done that never happen (I ultimately re-follow him at the start of every offseason/trade deadline). He might still be one of the best--if there are 100 national reporters throwing rumors out there, he's probably top 10 or so...but there are only a handful that are really good at it (Rosenthal, Passan, Sherman, Heyman, Olney, Morosi (when he's not focused on other sports)).
For the back up catcher I wonder if the Dbacks would have an interest in Avila for Kintzler swap. Kintzler makes $900,000 more, but it would free up the catching position for Kelly and Ryan for them. For the Cubs it gives them a lefty backup that can throw and his framing was better last year.
Even if his framing numbers were better last year, hasn't he had a reputation for being a butcher in that department for a while?
I had kind of the same idea with Jason Castro a week or two ago (I think I posted it here)...Mitch Garver was strong his his 300 PA last year, and Willians Astudillo is a sensation (at least in Jeff Sullivan's mind) and needs somewhere to play. So that makes Castro an $8 million third catcher. Kintzler has a positive history in Minnesota; adding Duensing in too is basically even money. And Castro seems to have that leader/good defender reputation that the Cubs are looking for.