I didn't get "Jug will remain a good guy" from #13 at ALL. In fact, I got the exact opposite of that.
Basically, we see the Wrecking Crew beating the shit out of Jugs, all the while saying things like "Hah, the Juggernaut? I remember when I could count on you to beat any hero who got in your way, but now you're getting your ass beat by us, the Wrecking crew!". They go on to beat him senseless until he's saved by his teammates...and then the good shit happens.
He hears voices (most likely Cyttorak's) telling him to rape one member of his team and kill the others. The voice tells him that he doesn't have to remain weak, that he could be a god again if he wanted. All he has to do is-
And then we see Jug going to where he first found the gem. DUN DUN DUN!!!
Cyttorak is messing with Jug's mind(which we find out he's done the entire time Jug has been Jug. Which would explain some of the evil he's done), trying to turn him evil again or at least turn him into a tear-it-up machine and we all know Jug ain't great at pushing off mental suggestions.
Of course, Jug could be a good guy and suck still, but man...looks like he's on his way to kicking-your-favorite-hero's-ass-ville to me. I sure hope so!!@!!E#QRR
Awesome, awesome, AWESOME comic.