What current Reds player is the key to success for the remainder of the year?

Yes, I know it's a team sport. And I pray to the lord above that we get more pitching help, but since we don't know who they might be it's difficult to speculate.

So....which current player is the key to success in the 2nd half? More importantly, what does he have to do/improve for that success to happen?

For example, someone might feel that Jr. has to stay healthy and increase his offensive production. Others might feel it comes down to Milton (assuming he is here) not imploding again. Still others might say that Lopez getting out of his offensive slump would be the key improvement we need.

Just some examples....what do you think?