AJ was given a rematch because they have that clause in the first fight. That's why Ruiz have no choice but to follow what he had sign in the contract.
The promoters are smart enough to have all these clauses when putting up a fight they did the right decision to have a rematch because it is important for Anthony Joshua to win this fight and this is an important fight for his career and Anthony Joshua will be well prepared for this rematch and i expect to win this rematch.
But I do agree that if AJ wins convincingly he should give Ruiz a chance for a trilogy. Andy already in Saudi he meet the Saudi Royal family and has media day.
Anthony Joshua should win the rematch and whether he will give Andy Ruiz a trilogy is yet to be seen as he is not an easy fight for anyone in the division.