A potential avenue could have been created for WWE to orchestrate the breakup of The New Day with the injury to Xavier Woods. Upon his return, he and Big E could decide to turn on Kofi Kingston because he has gotten most of the glory out of the three men. This could have built up some resentment and jealousy from Xavier and Big E, particularly when Kofi was WWE Champion.
WWE is excellent at feeding the unexpected nature of the injuries into its storylines. For all I know, they could elect to do the exact opposite of what I am proposing and that would work out just fine. The New Day has probably been the most successful group WWE has ever seen. They have been a blast to watch over the last 5 years.