It is the job of a manager to have the most productive and efficient group of workers.
No it's not. The manager's job is typically to accomplish some larger goal (like win a Superbowl). The manager has workers who will help them accomplish this. That's a very important distinction.
If you had TO as any part of a team dynamic, the best advice to take would be to get rid of him - ASAP. He does not help teams win - this is demonstrated.
That's not true. It's been demonstrated that he does help teams win. 2000 San Francisco 49ers led by Jerry Rice (6-10)
2001 San Francisco 49ers led by Owens (12-4)
2002 San Francisco 49ers led by Owens (10-6) - won a playoff game on Owens' 9 catches for 177 yards and 2 TDs, which was over haf of Garcia's passing numbers
2003 San Francisco 49ers led by Owens (7-9)
2004 San Francisco 49ers without Owens (2-14)
It sure looks like he helped the 49ers win.
2003 Philadelphia Eagles without Owens (12-4, lost NFCCG)
2004 Philadephia Eagles with Owens (13-3, won NFCCG and almost won Superbowl on the back of Owens' 9 catches for 122 yards)
2005 Philadelphia Eagles with Owens (4-3)
2005 Philadelphia Eagles without Owens (1-3)
In fact, it can only be demonstrably proven that the teams he has played on are MUCH better WITH Owens than without him.