I went with the high estimate there. I probably should have explained that we really do not know how much the Sega CD sold, and estimates are everywhere from 1.5 million to 6 million. It is very likely that the system outsold the Saturn in the US, but the Saturn was only ~1.5 million in North America, so even if that 6 million number is twice the actual total, given that the Sega CD was more successful in the US than elsewhere, that's still probably more in North America than the Saturn sold.
Gah, Annet Futatabi! I don't own the game at the moment, but have played and beaten the game on my Sega CD, several years back... I should write something up for it because of that. It's an okay but frustrating beat 'em up.
As for Earnest Evans though, I haven't played that game for either Genesis or Sega CD, but given the consistently terrible reviews it gets, I've never really wanted to.
If the gameplay was as good as the story, it'd be in the top 10...