I (regretfully) cannot find the redit pose anymore so let's use a BLM's post of 8k without echo. As stated before on this thread, a solo blue mage pushed 16k and can burst 32k. that is with blues solo buff solo buff which doubles damage and healing. so without that buff it would be 8k (which I assume since this is first phase, used the instants not all at once) and burst at 16k (which I assume is all instant casts active) that would mean at tops it can deal 16k dps in a short succession or 8k in a long fight.