Looking purely at the Oakland game. I noticed two flaws in McKelvin's game. One could possibly be a coaching error as it occurred throughout the game but one is definitely his. The first being how far he was playing off Moore in coverage. He was always a solid seven yards back from the rookie. This could be a coaching thing as this happened on two of the big plays that highlighted Leo's struggles. If he was consistently doing this without being told, I would think the coaches would say something and change the way he was playing.
I think Leo's biggest mistakes in the game is letting the receiver to the inside of him on go routes. To my understanding, (and correct me if I'm wrong), the cornerback should be between the receiver and the QB the best he can. McKelvin is listed at 5'10 and Moore is listed at 6'. So Leodis giving the inside to a taller, and presumably faster receiver takes away any positioning advantage if Leo was on the inside. I understand safety help and all but still.
I am new to posting so please let me know if I get anything wrong. Thanks for reading