Hiring a “big name” that doesn’t give you individualized attention or the show on time is pointless. Now, I will say that teaching experience with your arrangers, especially those that have taught good bands at a high level, is very important to consider (also in drill wiring.). There’s something to be said of an arranger or drill writer that had to teach his or her own music/dots.
I recently sold two different bands the same used show from my library. One band got a second division. The other band made 5A State for the first time. A good arranger is only one cog in the machine. A director with “boots on the ground” has to make the show come to life.