Wisenheim reporting back for duty.
I realized that seperating the "risk curve" from the "investment curve" (as it is dictated by the game-layout) doesn't do any good after all.
You miscalculated the dmg output Essence.
Immos
turn4: 25
turn5: 40
turn6: 60
turn7: 85
turn8: 110
turn9: 140 (6th Immo)
turn10: 170
turn11: 200
turn12: 230
turn13: 260
Dragons:
turn4: 20
turn5: 30 (cant afford the 2nd one yet)
turn6: 50 (2nd drag)
turn7: 70
turn8: 90 (cant afford the 3rd one yet)
turn9: 120 (3rd drag)
turn10: 150
turn11: 180
turn12: 220 (4th drag)
turn13: 260
So, on a streak of 13 turns the dragons finally manage to draw the Immos. (while the Immos hit the 100 and 200 dmg mark one turn earlier than the drags)
Now getting back to the circumstances of the game, the streak shown above is already well past the first 5 turns because you simply wont have 5 pillars in your starting hand;
more like 2-3 pillars on turn1, 3-4 on turn3, 4-5 on turn5 ...
This implies that playing an Immo probably even comes way earlier than the model streak above suggests, allowing him to build up dmg the dragon will realistically never catch up with.
In the theory of an infinite game of elements a dragon will certainly be the better investment.
In the actual environment of Elements, 18 turns are a long way to go and some 180 dmg output just might be enough to do the job ... which is why I still cant believe that dragons are superiour to Immos.
Coming back to the mana-curve in Mtg, there actually is something like this in Elements.
While quanta certainly dont get burnt after every turn I still have to calculate with them and I could still draw a "curve" as to how my quantum supplies will build up over time and adjust my deck accordingly.
The above model-streak suggests to me that Paul Sligh probably would have laughed in the face of dragon spamming opponents while sticking to the less amazing but much more suited to the quantum supply - Immos.