Those are really common words, especially at the beginner level (I'm pretty sure even Genki uses them) Finishing all of RTK just so you can start Tae Kim is waaay too much effort, IMO. I'd argue it's better just to do the first few hundred words from Core. Or even just look up the ones you don't know (he gives a list at the beginning of all the new words).
Edited: 2014-08-07, 6:59 am