Connecting the DoTs: A Summoner Guide

[Sleigh]

You can certainly do it, however, using Miasma II in DWT is a DPS loss versus using it outside of DWT first. You would be doing this out of a convenience but not helping giving you an optimal performance.

EX. Ruin II -> DWT > Fester > Miasma 2 > Tri-D > Ruin 3 spam > Ruin 2 > Fester > Deathflare.
You have replaced a Ruin III (120 potency) for Miasma II (120+ potency). Miasma II + Contagion vs a Ruin III is a DPS gain under DWT, however...

EX. Miasma II -> DWT > Fester > Ruin III > Tri-D > Ruin 3 spam > Ruin 2 > Fester > Deathflare.
At most you have shifted the GCD very slightly but you are still doing the same skills within the same time. However doing it this way, Miasma II +Contagion (120+ potency) is now replacing a Ruin II (80 potency) thus leading to a higher gain overall.

That's a good point. That said, in most openers, you have a bunch of crap to put up in the initial DWT and I think it's not good to use it prior to DWT in your first 15s~ since that will be a R2 in DWT anyway.

great guide i didn't see any mention that fester got changed now hits more than 3 mobs

You must mean Bane, Fester is and always has been a single target hit.