I added Sam Malone because he was the reason to be introduced. Also, he was introduced to help Sam Malone. Then Sam Malone became his friend because... well, no one else other than Sam and Diane can pull him out of the dark hole after the wedding disaster. As for Bennett Ludlow, I don't know why I added it, but he was his mentor. Well, both shows didn't explore Frasier's relationship with Ludlow very well.