User blog comment:IamJakuhoRaikoben/Chapter 466: Assassination, Review./@comment-5303512-20151216145356/@comment-7418318-20151218094757

While I agree that Natsu and Gray could easily deal with Marin, they are currently not in the guild.

After rescuing Natsu, Happy took a stop at that lake to cool his burned paws, so they aren't yet back in the guild.

And unless Gray along with Erza and most of the others are more tardy than their situation allows them to be, they are already gone from the guild and rushing to their assigned battlegrounds to back up the other guilds.

BUT there's Makarov. While he didn't exactly shine in this arc so far, I'm sure he alone is more than plenty to take care of Marin by himself if need be.

As a crazy hope/wish/theory it would be fun if the Connell family returned to the guild. Bisca is using re-quip, which is spatial magic, and looks good so Marin would give her a pass and capture her, giving Alzak a good excuse to go over his limits to save his wife. While it would be a bit of a stretch for him to beat a Lieutenant of a shield in 1on1, I could forgive and even appreciate it, since he's fighting for his continent, guild and wife all together.

Maybe Marin will even capture Asuka, due to her being held in Bisca's arms when he takes her, which would up the scales even more for Alzak.