What to do with Mack

I know you said to keep him but this is getting crazy. When do you drop him?

What to do?...nothing, he's a star!  Pick up a 2nd DE if you must  

I am in the same boat.  It depends on your scoring setup if it is big play or tackle based. I am sitting on him and picking up other flex DE/LB guys here and there to fill in while I wait and see, Bosa not a bad option & Clowney worth keeping an eye on.  My league is tackle heavy though.  Also, I am on Yahoo and it is pretty friendly with the IDP positional classifications.