After the main lab assistant, Zack Addy, was found to be in cahoots with an evil character a few seasons ago, the role of the lab assistant on Bones has been played by a rotating set of actors and actresses, any one of which would be featured on a particular episode.
The episode of Bones from the week before last (U.S. airdate,"The Patriot in Purgatory") brought together Dr. Temperance Brennan's lab assistants to all work together.
This interaction as part of Dr. Brennan's Phil Jackson-influenced team made me curious about why this assistant role has been designated to all of these performers, and not just focused down to perhaps a couple of recurring assistants with stronger character depth.
I have worked in science, and while there is some variety in personnel, I don't see this casting move as being symbolic of scientists working with a variety of different assistants on a day-to-day basis. Are we to believe that we're getting to know bits and pieces of these characters as Dr. Brennan might with her semi-limited ability to socialize?
If not, is this totally a decision based on economic and logistic needs of the production staff?