frankly, i think the arc was just a bit too mean-spirited to be enjoyable. the "torture the puppy" bit has been done...now apparently we have to watch as it's ridden into the ground? bleah.
Well, it's obvious what's going on here. Nina's "crush" on Kade was just a smokescreen. What she's really after is getting Ace and Kade together, as she believes they're destined for each other.
And if you believe one word of what I just said...well.