Style is, a how; a manner with which an idea or material is delivered. Some would call it delivery, some, tone. I believe that in creative outputs nowadays, the how is more powerful than the what (Click this < _ > for further elaboration on that). Nothing new is being said, and if there is, probably not in the right way.
Would this be an implication that idea has subordinated itself to execution? And if so, does the arranger then take more credit than the composer? Perhaps not. Of course many would insist that the balance between idea and execution is fundamental to the creation of art. By that logic then, the arranger, is half the artist. Many composers are their own arrangers, and to a certain degree, arranging is composing.