They need to bring back Jimmy/Steve.
There needs to be some kind of closure to that storyline. His reappearance in season 5 was weak, leaving things too up in the air. He was a main character for three seasons straight, it doesn't fit with the story to completely drop him.
Every time Fiona gets involved with a new guy, we know it won't last. With Gus and Sean, even though they spent entire seasons on them, nobody connected with them and we knew they weren't permanent. Jimmy/Steve has to eventually resurface and get involved in the story again in some way, he's not just a random character like the others. Just feels a little distracting because he played a huge part in the show and does need to come back at some point.
"During the meeting, I was the perfect prince. But I wasn't me." -Zuko