Or maybe it was the 40th anniversary and they brought back as many people as they could and Hayden realized he liked it and could also make a ton of money selling pictures and autographs.
Hayden probably wouldn’t have made the decision himself, due to the harassment he received for his performance as Anakin. It wasn’t his fault, but fans still bullied him, just like Jake Lloyd. Thankfully Hayden didn’t go through an emotional breakdown like Jake did, but I think he was still hesitant to show up at another Star Wars event prior to Celebration 2017 in Orlando.
Yes I wouldn’t be surprised if he skipped prior celebrations because of the PT hate. But I’m sure those fears went away completely at the 2017 celebration and that’s why he’s back (i.e. not because of IX).
I agree that’s why he’s returning, and I’m happy Hayden is doing so. We’re not exactly sure if he’ll be in IX because of his presence at Celebration, or the many rumors about Anakin’s appearance. We shall see.
On a side note, I’m shocked that Mark Hamill isn’t listed as a guest. I know he’ll have a small, yet significant role in IX, but he usually comes to Celebration almost every year. Maybe he will be there, but his appearance will be a surprise in Chicago?