Let me try to help by describing the problems I had a few weeks ago when first learning the Hustle.
I found the timing, &123 hard to follow, because I assumed that the "1" in there fitted cleanly on the "1" of a bar (measure) of music. So I assumed that there was a pause on "4". At that point I realized I was doing things more slowly than others.
My next assumption was that I was doing it at half speed, so I tried fitting &123 into 2 beats. That is crazily fast.
Finally after doing some more watching, searching etc, I discovered that the &123 timing uses just 3 beats of music. The next &123 starts straight away. So if we count the beats of three bars as 1 2 3 4 5 6 7 8 9 10 11 12 we dance 4 groups, with timings as
&1 2 3
&4 5 6
&7 8 9
&10 11 12
and then we're back on "1".
This is probably why the term "syncopated is used. It's not a normal form of musical syncopation, but the timing moving within bars creates a syncopated feel.
With this explanation, take a look at the hustle clip on dancevision's site and you'll see what I mean.
I hope this helps.