Utter B*llocks! Ian Levine to me was the best DJ in the world when I was young and he only used one deck- The way he introduced a record got the hairs on your neck standing up with sheer anticipation of what was about to blast out of the speakers - ASk anyone who went to the Mecca and hear Otis Blackwell s - Its all over me for the first time. Its got nothin to do with any technicalities of mixing beats etc. OH and guess what he used only one deck because the other was broken.
P.S heres a record that would destroy any technicality of Djing in an instant! M - Pop Musik original first press twelve inch. especially if you had no time to cue!