Rogers wasn't "caught." He was told to clean whatever it was off his hand, and he did. You allege that since his performance from that point forward continued to be stellar, he must still have been cheating; he just moved an illegal substance from his hand to another place. You have no basis for that.
There have been pitchers caught red-handed on the mound in attempts to cheat, most famously Joe Niekro's vain attempt to flip an emery board out of his pocket, hoping the umpires would not notice it falling to the ground. There is no such similar prima facie evidence Rogers just got better at cheating once he was "caught."
Rogers wasn't "caught." He was told to clean whatever it was off his hand, and he did.
_______________________________________________
Therefore, he did nothing illegal since he wasn't caught. Do you even know who told him to clean his hand? I'll give you a hint, it wasn't the umpire. It was in his dugout as he came in from the first inning.
This isn't the first time Kenny was "accused" of cheating. But last time, he was called on it for scuffing the balls with his finger nails. Every single ball had the same scuff on the MLB logo that he pitched. He denied it, but was warned they are looking. After that, they hit him like he was a little leaguer. Gee, must be coincidence.