Grey-Thompson, who won 11 gold medals as a wheelchair racer, also said that it was good for Pistorius to be able to redeem himself after missing out in the 200m and 100m earlier in the week.
"I think it's how the athletics had to end," Grey-Thompson told BBC Sport. "It was perfect having Oscar Pistorius as the last event. He was despondent about his other events, so for him it's a huge amount of relief.
"This also proves that Alan Oliveira can't run a 400m."
Great Britain are currently third in the medal table with 33 golds and 118 medals overall.