Chuckie was named mlb pitching coach in oct 2016.  
Hard to find a lot of cross over cases because of rebuild.  But here are a few
JT.   Had a B.B./9  of.  3.3,  2,  3.4,  4.4.  From 15 to 18
Folty had a B.B./9 of.  3,  2.6,  3.4,  3.4.  From 15 to 18
JJ had a B.B./9 of.       2.7, 2.8, 4, 3.3
Wisler had a B.B./9 of  3.3, 2.8, 3.9.     From 15 to 17.  2018 only has like 40 innings
Seems the walks spiked
Team B.B./9.    3.47,  3.40,  3.65,  3.89.     2015 to 2018.   To me getting rid of Roger was the bigger mistake. 
Take this with a grain of salt since the data set is so small.  But I have done this with chuckie before. He has always come in and the staff immediately throws more balls.   
I am excited with the better pitching this year.  We have seen some flashes from our guys.  But I really don’t think we take that next step with the current relics we have coaching right now.