On the internet you'll find many theories about disney and how the movies are connected.
I came across some other thoughts or theories.
One of them claims that Mufasa was responsible for the great draught.
YOu don't believe it? Go see for yourselves!
http://disneytheory.com/2014/05/18/thelionkingtheory/
As for me, I still don't think that really happend. I believe these elements are there for dramturgical reasons and not because Mufasa pulled the strings.
But what do you think?