Actually, the "LOTR sense" is exactly the Biblical (and Catholic) sense. If you actually read the LOTR in depth (i.e. the appendices), you'd see that there had been both good and bad stewards, but they still retained the authority of the office, until the last Steward surrendered his office to the "returned King".
J.R.R. Tolkien WAS a very devout Catholic. He understood the symbolism of the office of steward very precisely.
Makes perfect sense that that was the whole topic there. No wonder that ozzy look alike jumped into mind when you mentioned steward. However, it's not in the bible.