If there is a Smash Direct there will 100% be more than 2 characters revealed, especially considering one of the supposed characters is an echo. There's just no scenario where only 1 unique character and 1 echo are revealed in the final direct in my opinion.That doesn't mean more than 2 will be revealed before the box starts shipping, completely plausible for the box to keep that format and show everyone announced up until the game awards.
They specifically said they know characters that aren't in this leak
Which Ken is
So it have to be 2 or 3 that aren't
I believe
Ken
Shadow
Chorus kids
And Isaac are right by coincidence
Rio banjo and geno and mach rider
Inceneroar
Elma
And sora are in
73 character roster
8 echoes
108 stages
We have had an "insider" say he has heard Banjo is definitely in though, which we haven't had for any of the other Grinch leak characters (outside of the pre-existing Ken). I don't get why Chorus Kids are somehow the likely one to you.