So, since I made my reply about a week ago, I have decided to fool around with techniques that involve being near the edges of a map. This is not necessarily exclusive to back-to-the-edge situations. I have found playing near edges on certain maps can actually be very good for Xiba and I have proven almost my entire previous post wrong. I'd like to share my findings with you.
First I'll go over situations that involve having your back to the edge. A very simple way to put some distance between you and your opponent is to use 1B. Normally for defensive gameplay and keeping distance, 1B does a low far-reaching attack that pushes an enemy away a little bit if they are too close. It won't force you over the edge so it works, but it also normally takes a step backwards during the attack so you may end up about as close to the edge as you can get. The benefit, though, is that you've bought yourself some time to get away from said edge while also getting a pot shot off for a little damage.
Another good method is to use the 22*88B as suggested in the original post. This will launch the opponent very high into the air and also right over your head. While they are on their way down, a well-timed low or mid level kick will give them the push they need for a quick ring out and a win for you. If you think that you're actually too far away from the edge or simply unable to get that kick in, this is easy to follow up with B while facing away to butt-slap him 3-4 times for heavy damage. It won't get you the quick win but at least you've made the most of the situation by both dealing good damage as well as turning the tables on who's near the edge. I have found that attacks like this also may convince the opponent that they're about to be rung-out and they neglect the next few seconds of the fight thinking they have already lost.
The last method of back-to-edge I am going to mention is also probably the most dangerous of the ways I have found. It is high-risk/high-reward as it does involve some trickery, baiting, and delicately executed kick attacks. If you can go for some repeated 2K's, hopefully you can induce a low-block from your opponent. As soon as this happens, coming straight out of the low stance you should be in (aka While Rising) a K will do a mid-level upward attack that will launch your opponent into the air. This works because the low-block is vulnerable to a mid level attack. YOU SHOULD BE AWARE that this attack also has another KK to add to it, which results in more upward kicks. This is a huge risk because Xiba does a flashy jump backwards (very far and high) which almost always guarantees ringing yourself out. DO NOT USE MORE THAN ONE K WHILE RISING to prevent from this happening. Upon correct execution, You will have successfully launched your opponent into about a mid-level air, also pushing him back a ways as well as Xiba will take a step or two forward. This is a perfect opportunity to side step to safety.
Now for the fun stuff: Having your opponent with his/her back to the edge and you on the inside. I'll start by playing off that same (While Rising) KKK(BE) attack that xiba has. This works very well and can do great great damage by tacking on a Brave Edge to it. It can also ring out your opponent if they are very close to the edge for a quick win. (This attack is also very good for punishing an aggressive player by getting good damage in while also putting distance between you and him/her. This is viable at any point in the game, so don't limit yourself to just ring-edge scenarios with this attack)
My favorite way that I have found to get a ring out is Xiba's low attack, 33AA(BE). This will do some decent damage, push back your opponent, and also knock them airborn to about a mid-level. The final blow with the launch airborn is good for getting your opponent to flip right over the edge of a ring. Be warned, this attack only has 2 low hits if you don't use the BE at the end and will not launch your opponent. I recommend saving this attack for when you have the energy to use the BE at the end, otherwise just avoid it entirely.
It was strange to write this post as it almost completely disagrees with everything I said a week ago. But it became relatively amazing for me to find that Xiba, in a ring-edge situation, has some decent tools that allow him to make something out of nothing. I hope this helped. Cheers!
Tucker