This is a good thing in my eyes. Far less annoying to me than Maul's return from the dead.
Truth, though as I understand that happened in Clone Wars, not Rebels (though they do use him in rebels)
And would <3 to see Kyle and Jan show up. That's some Legends worth revisiting.
Same writer though, as much as I love Mauls character in clone wars and in rebels, his comeback from being sliced in half by obi-wan is a bit absurd and its those absurb moments in the films, cartoons and books that make me lose that suspence of disbelief. I know this is a fantasy world, but I felt that as good as Maul was they could have brought in a new character at that stage in the series and have it work just as well. I've loved the character since that point (voiced by Sam Witwer who also does the Emporer in Rebels and another great (butt ludicrous) character, Galen Marek the secret apprentice.
I've loved what Filoni has brought to the table for Star Wars , but there have heen a few 'duh' momennts, but this is a common trope in Star Wars media and both Lucas and Zahn have had them ( for example some of the inconsistencies, and the omniscience or omnipotence of certain key characters)