The blog post regarding JMK says we’ll be playing through Revenge of the Sith to acquire him, so a dark side Anakin seems like the logical choice for the next GL. Sith Lords are the opposites of Jedi Masters so I think the naming makes sense.
If SLV is the next GL, guessing R8 General Skywalker and 6 star Malevolence will be required to kind of mirror the JMK requirements. My fear is KAM will be a requirement in the same way WAT’s a requirement for JMK. Anyone want to take a guess who else will be needed? I think Padme, Darth Sidious, and Ahsoka are also possibilities.