I asked something somewhat similar recently and I don't think you can tell just from the WISC scores. I have two kids - one is definitely 2e and the other one is just gifted (the post I've linked stems from me overreacting thinking that she might have a 2nd e, I've since been talked off the ledge). They both have high GAI's but low processing speed (the 2e kid has a bigger spread (+4SD) but even my single e kid has a 2SD spread. They both have average working memory. Their school performance is polar opposite though.
Anyway, here's the thread -
http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/225154/2e_diagnosis.html#Post225154I'm sure the usual experts will also chime in with info more specific to your case. I'm not at all familiar with the DAS-II.
