Wouldn't drop Blair.
a) He went in hard
b) He DID kick a goal earlier
c) Thomas should have taken that kick anyway
d) He's better than Davis and Lockyer
His influence was down, and we may be forced to drop him due to the fact that he is looking tired and out of his depth (isn't his fault, will come good with time).
I'm on the Lockyer bandwagon, the fact he is fresher, harder, and more experienced. When the pressure is on we know we can rely on Tarks compared to Blair.