Also, Becker makes the statement that "If you are with a MEL released aircraft with one reverse thrust inoperative and you have a failure at the other engine during take off, you will have no reverse thrust during RTO."- Not so. There is no restriction on using the one operative T/R during an RTO. The assymetry is easily delt with by rudder and nosewhell steering.
I think the point Becker's trying to make, is that if reverse thrust is inop on engine 1 and the failure occurs on engine 2 - neither engine is able to provide reverse thrust; so he's right that you will have no reverse during a RTO... This makes assymetry a non-issue (but the extended distance reqd to stop a slight worry if the scenario wasn't accounted for in calculations).