Let me clarify a thing: if you are not in the range of the 20k coupons+ingots per month then overstacking move 1 is not worth it for the simple reason that the advantage you gain is not big enough to grant you an overwhelming advantage against other f2p/low cashers that did not behave like you.

ICEx is telling you to go that way like if was possible for a f2p to get a 40k move 1 by leaving move 2-3-4 at 20k before your f2p rivals owned a 34k move 1 and 3 29k+ move 2-3-4. Since this is not possible if you are not in the 20k per month range then even if you overstack move 1 you will still not be able to land enough damage to wipe out the enemies that did not do like you before they kill yoy back, overall because you do not own ninjas that let you do it (they all cost 20k+ coupons).

Yes and seemed to me right to say that if you are f2p you should never go for this policy because is counterproductive on long term. Only if your move 2-3-4 are comparable to your rivals' then you may think about overstacking, if to overstack you are compelled in leaving move 2-4 so far behind your rivals' move 2-4 that the first attack the enemy do they die then your move 1 has to be so strong that when they are able to move they are at least halved in hp.