I think the Black Leader line makes sense in the context of the scene. After all, Ackbar didn’t mention how the Oscillator was damaged.
As for the new implementation, it still feels like Ackbar isn’t talking with the X-wings. In my version I had reversed the shot so that Ackbar looked from Taslin Brance to the viewer as if addressing someone else, and I think that works better. It also needs something by way of introduction. I used a line from ROTJ, but surely there’s something that will work better.
That’s why I’d keep the “Looks like our friends got in.” line. Basically with this you’d replace the “Black leader, the oscillator is damaged” from the pilot with Ackbar’s version of the same line that also includes the added information of the oscillator still being functional. Then you keep the original line explaining how the damage came to be.
And I agree with your suggestion of reversing the shot.