Say didn't you used to be Matt Harvey stud pitcher for the Mets?
That was three teams and five years ago. Harvey never recovered from serious arm trouble. His time in the big leagues is likely limited so the time to fade him is now because chances are going to soon run out. 
Harvey made his first start of the year six days ago against the Reds. Predictably it didn't go well. Harvey gave up three runs in three innings allowing four hits in a 5-0 loss.
Adam Wainwright is past his prime, but he's started the season well going 2-0 with a 2.00 ERA. He's facing a Royals club that is not playing well and ranks 29th in runs scored.
The Cardinals have started to get their offense in gear averaging 4.5 runs in their last six games.  
St. Louis has won three in a row - all by 3 or more runs. The Royals have been a bad road team losing 102 of their past 150 away games.