Hypothesis:  SNL is only as good as its black people. 

Evidence:  Eddie Murphy, Chris Rock, Tim Meadows, Tracy Morgan.  Excellent black people.  All have memorable performances and most have gone on to bigger and better things. 
SNL status:  epic. 

Finesse Mitchell, Kenan Thompson.  Mediocre black people.  One is a guy with a very narcissistic website.  The other is a Nickelodeon alum that does a good Bill Cosby impression. 
SNL status:  meh. 

Conclusion:  SNL is indeed only as good as its black people.  Bring back Leon Phelps! #entertainment