The reveal of the Klingon back-up at the end of The Defector was a fun twist at the end, but it hardly makes any sense.
So Picard can call someone up and ask for Birds-of-Prey whenever he wants, and they will covertly travel with him for days to the Romulan Neutral Zone? This was well before Picard carried any weight with the Klingons after overseeing Gowron's installation. At the end, Picard asks Worf to send the Klingons his compliments. Nice to know the Klingons are so generous.
Then when the trap is sprung, what kept the Klingons from taking matters into their own hands and attacking the Romulans? After all, Klingons have an innate hatred of Romulans. The Klingons were downgraded literally into tools.