We've already had quite a bit of discussion about Colonel Brandon's romantic temperament, and in this week's reading, he shows it even more.
The offer of the Delaford living to Edward, who is virtually a stranger to him, is made on the romantic principle of not wishing to see two young people 'long attached' to each other divided because of money and the family's objections.
His action here is like he is trying to right the wrong that was done to him personally in the past. In a way, this is what delayed him in revealing what he knew about Willoughby, too. He believes in romantic love and that people who are attached in that manner should not be prevented from being together.
What I like about this is that Brandon is showing himself to be a man of action where his principles are concerned rather than all talk like so many of the other characters in the story.
I also found these words of his to Elinor interesting: "Mrs. Ferrars does not know what she may be doing -- what she may drive her son to." I suppose he was remembering his own sad history again there, but I wonder what he meant by that? If Mrs. Ferrars would drive her son away to elope, that could not be worse than what appears will happen anyhow.