I would have to say the wreck was on Joey for trying to block but that is what everyone would do on the last lap of Daytona. To me it's just a product of restrictor plate racing.
This.
Brad got the push that any driver sitting in second on the last lap dreams of. Brad made his move about as late as he could and Joey tried to block it. The block was never going to work and it slowed Brad which ultimately got him turn by McDowell.
But, who isn't going to block any run that comes at them on the last lap. I don't blame Joey for blocking. The wreck was a product of the racing. I lean towards no fault in this one.