By applying DoTs, you delay your burst combo and all your CDs by 3 gcds.
Each rotation has its own advantages and disadvantages. It depends on the timing when tank pulls.
In a coordinate group, it might be prefer that you put out Suiton as soon as you can to help other dps as well.
In term of personal dps, the opener has very little impact on your overall dps. Having your burst out early might be better since the longer you wait, the more likely that you will get interrupt while doing your burst (boss jump away, you get target by mechanics, etc....)

@Ehpier: your math only shows the first 6 gcds. The last rotation is used when you blow all your CDs including Suiton and Kassatsu to have really good burst to start with. The first two rotations might have higher innate potency. However, you will have to reapplying dot with TA and that is when two rotatiosn iron out to be relatively similar in dps.