Honestly speaking getting a 110/120k move 1 costs as much as getting 4 70/80k move 1-4. If you have 4 70/80k moves and you run good defensive/high healing lineups you beat whoever has 110k+ move 1 and 40/50k move 2-4 for the simple reason you don't die from the hits the 110k lands while his 40ks die from your hits. When is 4 vs 1 left that 110k matters really low.

So is all up on how much you spend in the game and how old your server is.

In the sense that not always the best way to go is to overstack one single move.

It's your only hope if you are f2p, but if you spend is actually not always true (it is for swb, but for everything else no and if you spend do you really care for the rewards of swb? In the sense that you care for the competition, but i doubt you really care to get 10 more advance refinements when you can just buy them).

Yes, initiative matters but, up to a certain point. Overstacking injury and atk/nin on one single move matters, indeed, but up to a certain point.

Many of our current whales still go on with the policy of move 1 but just because they were raised for months in thinking it was the best way to go because when they were 100, 150, 200k power actually paid off a lot.