Tailgate didn't feel like last minute to me. Cyclonus deciding to not act on his impulse to just kill Whirl saved his life. It was something in the end that he earned and felt like a nice and well done. In my opinion. Jumpstarting, the swords, all of that had been previously established to some degree and even with the stabbing fakeout it still felt like a very logical way to go. Nothing felt forced with Tailgate or out of place. Others might disagree, and they're allowed to, but it still felt right to me.