Did Butchie strictly become pigeon holed as Omar's ally/friend?

It seemed like in season 2 Butchie was in business with everyone. He was selling to Tilghman. He would work with Stringer/Avon. But by Season 5 it seemed like he was just Omar's guy and Omar and the two big bodyguards were his only allies. Im surprised Butchie wasnt considered off limits.