For me, Shaw is Anakin. I love Hayden’s performance in the PT and Matt’s performance in TCW, but I grew up with Anakin being the guy under the Vader helmet and the Force Ghost at the end of ROTJ.
IIRC, Hal’s said that he thinks Hayden Christensen as Anakin is a better fit for TROS, and I actually agree with that. It feels more like something that could have been plausibly released in cinemas by Disney in 2019, and for a project like this, that verisimilitude is important. But having the additional option of a Shaw version? Man, I felt genuinely emotional when I first saw jonh’s Phantom Four shot; I’d probably well up if I saw a version with Sebastian Shaw Anakin.