Scott Mescudi is Kid Cudi.
I worked in the music industry for a couple of years. Many producers demand publishing for producing the track. So, songwriter credits goes to musicians for writing the music and lyricists / writers get songwriting credits for writing the song. Also, when an artist clears a sample, the original artist gets songwriting credit as well. For Send It Up, there was 13 people got credit.
Where business comes into play is that artists (and their lawyers) often negotiate the percentage of the song being made. In the case for "Send It Up," you could split the credit 13 ways and everyone gets ~7.7% of each dollar. (This is simplified for educational sake). But a producer may sell a track for an upfront fee + 2 points per track or they may not charge an upfront fee, but want 10 or 20 points. (Points = Percentage). Of course, the "hotter" you are, then the more you leverage you have and the more you can demand (upfront and points).
Or if you are signed to Kanye's label, then there is probably a contract clause stating that Kanye will determine your points on a song. He may give you 5 points or .05 points.
So yea, Cyhi is getting checks. Who knows what Kanye is paying him?!