Being a Preston Fan, we had a James Perch type player in Billy Jones. He would fill in at cm, lb, cb and do a job, and was predominantly a right back. I think as an outsider looking in, Simpson playing so many games obviously looks well for the lad. From what I've seen, Simpson looks a decent right back, and I'd rather have him than a lot of other Premier League right backs (Bosingwa, Hibbert, Kelly to name a few).
I could be right in saying that Pardew has recently said that Perch is in the form of his life, and you can't argue much really. He's played everywhere and done admirably in every role asked of him.