All the 7 Dragon Slayers would fodderise the ef out of Night Raid. Only big players Night Raid has got are Bulat,Akame,and Tatsumi and they are just not enough to cover for the their entre team nowadays against all these Dragon Slayers.
Hellboy level of power stops at around large mountain. While nightmares level of power begins around mountain and just keeps going up from there to planet. I'm going to say that old nightmare should take the win here with low-diff.
I don't really know what to think of where Jiraiya's level of power retroactively after that Urashiki debacle. But I don't also see Cracker being able to win against the pervy sage. Hm? I guess a stalemate is possible between these two combatants.