Absolutely. Besides knowing Asm, the other thing I've noticed is that debugging/general analytical problem-solving skills --- being able to grok the code and understand its operation in general, without having written it --- is highly correlated with RE skills. Of those I've worked with, those who are highly skilled at debugging tend to have RE experience; and likewise those who can easily do RE, even if it's something like analysing a protocol/interface and writing a specification, also tend to be very effective debuggers.