User blog comment:Miskos3/Fairy Tail Episode 246: Tartaros arc: Underworld King, Review/@comment-24546844-20150815140206/@comment-25111584-20150816185221

Sensory Link is a double-edged sword though. For example, Meredy using it against Rusty wouldn't really have been a great idea. Basically means that nobody can attack him as it would cause her pain. And, if he has a higher pain tolerance than her, he pretty much gets free rein as long as he doesn't attack her. Then he just causes enough pain to cause her to faint, but keep himself conscious. I dunno, Sensory Link was OP only when Meredy was ready to kill herself. Now, it'd be more of a burden, especially in a team fight. :/

Well, if Sensory Link can kill Zeref, then I'd rather have Laxus cast Fairy Law without Zeref noticing. Zeref defeated, nobody defeated. Or, if death is needed, Gray could just use Iced Shell. Doesn't really stop Gray and Laxus from being featured in battles. And Laxus is pretty much the definition of OP. ._./