Pitching coach Chris Bosio made a few tweaks , but with the Cubs , Arrieta did n't have to think -- all he had to do was pitch .
The Cubs freed Arrieta up to pitch how he wanted .
Pitching coach Chris Bosio made a few tweaks , but with the Cubs , Arrieta did n't have to think -- all Arrieta had to do was pitch .
The Cubs freed Arrieta up to pitch how he wanted .