Here's Roddy White's highlight video
He beat everybody.
He beat Goldson on the corner route
He beat Clements several times
He beat Spencer several times
Roman is just flat out slow. On the 90yd TD, I'm not sure what coverage the 49ers were in. They weren't in cover 2 because Lewis on the LOS. I don't know if they were in man coverage because Spencer lets Jenkins run completely free across the field, which of course of forced Roman to come up and cover Jenkins.
It looks like a Cover 1 since Clements, Bly, and Lewis play man with Roman deep. But because Spencer lets Jenkins runs free across the middle, Roman has to come up and defend him. Clements, on the other hand, thinks Roman is covering his ass so he plays the ball and of course misses. And now its a foot race.