The films doesn’t need anything to do with Anakin or Vader, something that is so played out and over done that it’s a toy selling joke at this stage. The tragedy of Vader gimme a break.
I’ve always assumed the tragedy of Vader was the entire saga. It just isn’t as obvious in the ST.
The Prequels are about Anakain’s fall, the Originals Anakin’s dark deeds and eventually redeemption. I think the Sequels are about Anakin’s legacy.
Kylo is motivated by Vader, hence the “tradegy” continues. Buy Rey is motivated by Luke, who was by extension motivated by Anakin. These two sides are conflicting.
With that in mind I hope for Hayden to return and play a vital role in redeeming Kylo (alongside Rey of course). Therefore closing the tradegy of Darth Vader.
The entire saga, while it does follow the Skywalker family, hence the reason why some call it the “Skywalker Saga”, does have specific focuses for each trilogy. The prequels were about the brotherly relationship between Anakin and Obi-Wan, the originals were about the family relationship between Luke and Vader, and the sequels are about the struggling and developing romance between Rey and Kylo Ren.