I've moved about the country a bit in time, and in every diocese I've lived, Pastors and Parochial vicars get moved about on a fairly regular basis. Having a priest assigned to one parish for that long seems very, very unusual to me, but I'm not familiar if this is unusual or par for the course in Chicago. In any case, it seems quite odd to me.
It is unusual. Several times he was suposed to be moved to a different church and each time he pitched a fit over the move and he was allowed to stay.
Moving them is the way they cover it up. Same for all religions, except muslim.