In reply to KING RIH.

Speaking on behalf of their most recent albums;
He wrote 90% of the 4 album.
and half of the songs from Unapologetic.

As for hits; Rihanna is about to release Right Now.. co-written by the dream. And he also wrote Birthday Cake.

So there's that.

Side Bar: I find it hilarious that Single Ladies is the only song The Dream wrote on IAMSF and it was her biggest pop hit. So in result, he wrote the most of 4. Ctfu her thirsty ass.