This discussion might belong more properly to the "references" section of the forum but...But looking at the printed rules, I may have misunderstood because I'm not finding clarity in the rules about whether you have to include the double twizzle; only that if you use it for a turn, you must fully execute it in order to receive the level for the turn. (See the Note under 4.6.2)
http://static.isu.org/media/505764/2086-id-requirements-for-technical-rules-2017_18.pdf
In any case, it seemed like everyone at the top had at least double twizzles in the footwork last season; and from what I've seen this year (which is only Lake Placid), the trend seems to be that teams are including two sets within the footwork now. Maybe the commentators will clarify.
Yes, looks to me like this season you don't have to include a double twizzle, whereas last season you had to: see 2016-17 requirements under 4.6.2. for stsq level 3 style A "Footwork includes at least 7 Difficult Turns (one of which being a Double Twizzle ..."
http://static.isu.org/media/320383/2003-id_requirementsfortechnicalrules_2016-17.pdf
I guess the idea behind the change is to encourage choreographical diversity, ie that not every single team would be doing the same double twizzles in every stsq, but we'll see about that...

