Actually, manual braking can exceed max auto brakes on the 767 (not sure on the 737) so if he was pushing hard enough, he could have gotten all that max auto would have given him. RTO is the most braking one can have but obviously only good for take-offs. Were the ground spoilers fully up thus ensuring the most efficient and maximum braking available? Anti skid working ? I have heard that SW will not use automation tools on their a/c (such as AT's, autobrakes) due to the cost to maintain - don't know if that's a true statement though.