I actually think that flame pillar is from the smn not from phoenix. If you look, phoenix moves forward in the exact same manner as it does when the SMN was using other attacks previous, kinda like Bahamut's wrym Wave.

In the Benchmark trailer the Summoner uses trance but a phoenix head appears above the summoners head.

Given that Bahamut came from Garuda and then the SMN used Ifrit which spawned Phoenix, Seems to me that the trances and Demis are based on the egi that was summoned - Ie - Garuda > Bahamut Ifrit > Phoenix.

Where then does that leave Titan and topaz carbuncle. We know that they are being reworked as Tanking pets are impossible if the Egi cannot die. Perhaps then there is a third Demi (unlikely i think, but something to consider) Else it may be that Titan is getting removed, but that doesn't make sense when they said there was a rework.