The author later wrote a bonus story based off the epilogue.
When Zack meets the little Cloud from this timeline:
Zack:' More importantly… Cloud, did you shrink?
Mini!Cloud: How do you know my name?
Zack: You're kidding. It is you? Did someone cast Mini? And then Confuse? Was it a marlboro? Those things are vicious.
In the penultimate chapter, Cloud and Sephiroth fights again, this time because of JENOVA's influence. Genesis brings an end to it by throwing Firaga at JENOVA. Repeatedly. Also counts as his Crowning Moment Of Awesome.
Genesis: "Honestly. I'm not sure what I missed, but it wasn't even a moving target."