https://data.ibtimes.sg/en/full/75670/thomas-matthew-crook.jpg
He is missing his front upper teeth. This would explain the underbite or pronounced chin here. 
So the quest is, how did he get his teeth knocked out?
BlackRock has now pulled the ad so either it is him or they have reason to believe it is - like I said above the angle of the first image is different (titled up) which can explain the differences in the appearance of facial shape.
Laura Loomer and TGP may have gotten something accurate - quite an anomaly.
https://data.ibtimes.sg/en/full/75670/thomas-matthew-crook.jpg
He is missing his front upper teeth. This would explain the underbite or pronounced chin here.
So the quest is, how did he get his teeth knocked out?