Excellent info in Fegans latest on Collins swing change :
https://theathletic.com/1112494/2019/08/02/luis-robert-nick-madrigal-and-zack-collins-search-for-purpose-in-triple-a-whether-its-there-or-not/
“But upon his return from Chicago, Collins not only reached out to set up work with Menechino, but was willing to quickly incorporate his recommended stance and hand placement changes, which might be uncomfortable for a while as he incorporates them midseason (though they’re made more comfortable by good early results). The larger goal seemed to be keeping Collins from leaning too hard into a strikeout-laden, three-true-outcomes identity that has come to define him.”
small excerpt