I did not know this but apparently William Contreras has been playing with a fractured middle finger on his left hand since May 7. Tucker's is on his right ring finger, so both injuries are on their drive hands. Contreras has a 122 since his injury.
I have a feeling Tucker has another injury that hasn't been disclosed. Even bad mechanics brought on by pain or discomfort shouldn't completely neutralize a players power like this.
Is his swing speed showing decline?