I’m gonna be honest, this does not sound very good. If you’re gonna resurrect somebody, it should be Palps.
I disagree because it diminishes the significance of Anakin’s legacy and redemption. I’d personally go with Darth Plagueis as you can have him reveal he influenced Sifo-Dyas to order the Clone Army and ultimately created the Skywalker bloodline, only for it to be revealed by the Whills that they influenced the midi-chlorians to create Anakin. I think it really contrasts The Phantom Menace beautifully as Anakin built C-3PO out of love and purity for his mother, while Plagueis only tried to create a vessel to gain immorality and this resulted in the creation of the Chosen One and the Skywalker family who are the extension of and part of the Ones. Very much in line with what we see and learn on Mortis.
However I’m not opposed to Darth Maul returning. I was a little iffy about it at first but the more I think about it, I really like it a lot. In The Clone Wars we see him running a crime syndicate and ultimately have Palpatine imprison him. So he could be bordering along the lines of unraveling insanity when we meet him again. This contrasts the seductive and alluring Darth Talon who corrupts the grandson to join her in overthrowing him while the granddaughter tries to bring her brother back to the Light before it’s too late. I also really like the connection between Darth Maul and Luke as they both have a history with Obi-Wan.
Darth Maul is the right villain for the last link to the era lost without diminishing Anakin’s arc.