I'm kinda surprised they gave him Cena. I love it. But surprised nonetheless.
Honestly, I don't know who WWE could get for an AJ Farewell tour where he runs back the hits. Cena, Balor, Nakamura. MAYBE Jericho if he leaves AEW.
Sadly doesn't sound that promising on paper. Cena is a shell of himself basically, Balor has little main roster credibility, Nakamura even less so + their WWE work was subpar, and then Jericho is not even someone I view as a notable Styles rival, plus he's fairly washed, so again, the appeal for that is pretty low.
I feel like yeah, you wanna envision an AJ farewell tour being filled with great in-ring matches with his storied rivals but I don't imagine that'll be the case. I think you just gotta give him the most fun and interesting matches on his way out, like against Dom, and then also I'd like to see him facing Gable, Gunther, Dragon Lee, Dunne, Melo, dudes like that... sprinkle in the nostalgia and homages for sure but I guess I like to picture a final year for AJ being a little more lowkey, check off some matches with exciting opponents and let the work speak for itself instead of trying to conjure up some kind of greatest hits tour when most of his notable opponents either don't work for WWE currently or are well past their primes. The people in WWE that he has history with and could still have a really good match with right now, would realistically be Owens, Zayn, Lesnar and Reigns I think anyways.