That's not "right now" information.
I believe he was told to stop shaking off the catcher "or else" and the game plan is to use his FB to set up his slider.
Len (or Bob) was correct that he needs to get to strike 2 before he gets to ball 3 so that slider dipping out of the zone can be effective.
Personally, I've seen way enough of him. Given that the Cubs aren't in a pennant race, he's serviceable, but I think the heart attack rates among Cubs fans would rise appreciably if he was called on to close important games...like during a stretch run or the playoffs.
"I believe he was told to stop shaking off the catcher "or else""
You are correct, every time he shakes off the catcher he owes Bosio a box of wine