AJ gives up a boxing clinic here, he masterfully shows that he still has it to get back his belt from Ruiz. Game plan was perfect from the first round, go around in circles, used his jabs, don't let Ruiz corner him, resulting in a decision for AJ.
And with that strategy, Ruiz was frustrated as he can't get inside and used his power, because of AJ's superior technique. For me, a trilogy is open, let Wilder vs Fury II fight and AJ finishing Andy Ruiz for all the glory and marbles.
Part III is always possible and I don't know if the results will be altered if Ruiz will truly prepare on this one. Because aside from gaining weight, he claimed that he's not really prepared for this fight.
https://www.cbssports.com/boxing/news/anthony-joshua-outpoints-andy-ruiz-jr-to-reclaim-unified-heavyweight-titles-in-saudi-arabia/Joshua on the other hand, really did prepare on this one. That is to reclaim his belt and of course to prove that he has still the power. If both camps will have do their rigorous training, what do you think would the outcome will be? Part III???
Part III is possible, that is, if the money in the table is huge that both camp can't refuse it.
For Anthony, having this trilogy and winning it will cement his status and proved that his lost in the first fight was a fluke.
For Ruiz, to proved that he is not a one hit wonder, and his name could be in the discussions as one of the best heavy's that we have right now, Fury, Wilder and Joshua are the big three.