I know this is sort of a broad question, but it's only got a few parts that require hard analysis.
The x7 title is wonderful, providing incredibly reliable defense without the traditional cost of token stacking. Having faced 3 of them, I know that you can whittle away at 2, but the third is typically the deal breaker. Of note, the variant I faced was PTL ryad with 2 adaptability glaives.
Since then, I've picked up the same ryad, but paired with a juke x7 Vessery and the palp shuttle. I've had excellent results, without losing a game yet (though it should absolutely be noted that those games were against relative beginners- and no, I wasn't trying to pub stomp, it just happened to be the only list I had on me when I was asked to run a game. My opponents got full wins for the casual league I'm also running)
All that said, is the 3rd defender more efficient than the palp shuttle? Sure, the palp shuttle requires some effort to fly, but the flexibility provided by palp, and Ryad's insane late game ability have been enough to get the job done.
What do you think?