For the 2 new 3DS music games,
SE ≈ SEGA * 6
SE ≈ Diablo like * 2
I presume SE means Square Enix, which means Theatrhythm has sold 6 times more than Rhythm Thief. Don't know what Diablo means though.
A Diablo-like 3DS game? Gotta be referring to Heroes of Ruin, no?