With all the Flame shock enhancing talents near the middle seems to make more sense to lead into elementals with a skill that effects flame shock and elementals and provides a cleaner path to magma chamber, if you choose.
This way at least if you want you can enhance you flame shock some and free up the choice to go down elemental path or play a mesh fire/lightning or whatever.
Seems redundant since even Fire Builds were taking Echo, Skybreaker, and Primal before the Lava Burst nerfs and Searing Flame fix. Both builds are taking all 3 post balance changes. Swapping the position kinda does nothing at all.