Winner: Shinsuke Nakamura
In my write-up before the event, I warned that it wouldn't be a good idea for AJ Styles to win this match cleanly. Shinsuke Nakamura could win the title, or AJ Styles could retain it indecisively, but the match shouldn't end with a clean title retention. Thankfully, that's not what the Greatest Royal Rumble gave us.
The match ended in a draw after AJ Styles was so furious he battled Shinsuke Nakamura on the outside, taking some revenge after three weeks of low blows and taunts. The two men were counted out, and the segment did a great job at putting over the intensely personal nature of this feud that's exploded in only a few weeks.
So the feud will continue, and SmackDown will benefit. Shinsuke Nakamura has fully entrenched himself as SmackDown's top heel at the moment.