After acquiring Brandon Marshall in a trade with the Broncos, the Dolphins’ coaches were shocked — shocked! — to learn that Marshall can be difficult to work with.

And difficulty with Marshall may be behind some of the changes to the coaching staff that the Dolphins announced last week.

Barry Jackson of the Miami Herald reports that there have been questions around the league about why the Dolphins moved Karl Dorrell from receivers coach to quarterbacks coach, a position he has never held at any level. But one clue as to why the Dolphins took Dorrell off the receivers coach job comes from an unnamed Dolphins staffer who told Jackson that handling Marshall was difficult at times for Dorrell.

(Perhaps Marshall should recruit Kramer to steal his chart.)

If Dorrell finds Marshall difficult, he’s far from the first: If Marshall weren’t difficult, the Broncos never would have let him go. Teams aren’t often in the business of trading away receivers in their mid-20s who have caught more than 100 passes three years in a row, but that’s exactly what the Broncos did.

So while Dorrell won’t have an easy task as the quarterbacks coach on a team that needs a major upgrade at quarterback, it’s Steve Bush, who was promoted from offensive quality control coach to receivers coach, who has the difficult job ahead of him.