The reason it is because Rough loves Knuckles cause in Sonic x she sinabi she loves when Knuckles is angry. She doesn't pag-ibig Shadow cause he's just a friend and Shadow loves Maria not Rough. Shadow doesn't really like Rough cause in Sonic x Shadow wanted to be alone fighting. Rough loves Knuckles and Knuckles loves rough he's just a hothead and he just doesn't want to express *Nor he ever does* But Knuckles does pag-ibig Rough I know it! The reason I know Shadow doesn't pag-ibig rough is because in one of the episodes Rough wanted to sumali Eggman's team to get puwang colony ark activated and Shadow sinabi "Huh" and turned around angry.