If Mir basically helps his opponent walk him back to the cage like he has done before, offering no resistance, I will be really frustrated and pissed off.
I actually don't know why he took this fighter a week after Barnett. Jackson better be working on his cardio, mobility, and wrestling or he's got little chance and I hate to have to say that.
On a positive note, if he somehow gets it to the ground or pressures Overeem standing, he can sub him or KO him. Mir looks slow but his strikes are hard. More than hard enough to put Overeem to sleep.