Joseph cites differences with coach Jay Heaps for the departure.
He told thebentmusket.com: "There was a change of direction. He didn't see me in his future plans. I didn't like certain things that were going on, I don't want to be specific. I still want to see the club do well, and I still want both of us to succeed in our careers. The best thing for me was to move on, find a different coaching staff, different team, and move on with my career. For me, it's all about winning now, not in the future.
"I need a ring in my career, if I'm going to get that it has to be now. Coming down here gives me that opportunity, being in such a great environment, it's an opportunity to be in the hunt for the playoffs.
"I thought this was the best place for me to be. In the last few days I've felt 100% secure in the decision, whether it be the players making me feel welcome or the coaches telling me exactly what they need from me, expecting me to make a huge impact right away."