Oh come on, there's a difference between vanishing offscreen and falling off of a highway overpass with walkers on top of you. And yeah, Kenny might be tanning in Florida if you left him at Wellington.

I think you missed the fact that I was joking.. Besides if I were being serious, then it would still make sense & be possible for them to have survived for a couple reasons..

• The overpass isn't very high up.. We can get an idea on how high the overpass was if we look at nearby buildings.. Its roughly 3 to 4 stories high, which is a height that can easily be survived especially if you have something to absorb most of the impact like a pool of water..

Speaking of which There is water beneath the overpass... I was joking about them surviving by falling into water, but after going to check the height of the overpass I see that there actually is water beneath the overpass.. So the possibility for them to have survived such a small fall into water is there.

• Furthermore, we know Walkers can't swim so if they did fall into water they'd have a pretty damn easy time getting away from them.. The only thing they would've had to worry about is being bitten before they reached the water.

Although Tripp & Ava are determinate characters which had 2 death scenes each, which means its unlikely we'll to ever see them again.. However I like these 2 characters so this is the head canon I'm gonna go with..