So recently me and a few of my friends upgreaded our armours to rank 3. We noticed that all of us upgraded at 81/100, curious about this we asked around. We found 3 more players who upgraded at 81, 5 more who upgraded in the 80's and 0 that upgraded below 70. This got us thinking that armours have a set value that will start to allow upgrading. In other words, you can't upgrade your tier 2 armour before reaching 80 / 100 threads. Remember that this is just a theory. It might not even be a 0% chance before 80, but rather a 0.01 at 1 / 100, and a 50% at 80 / 100.
This wouldn't be the first thing in the game that has a illusion of chance to it, and thats the reason why we think that this could be true. Look at the fixed pulls for Legendary Ninjas, or the rewards in trial breakthroughs. Both at first glace seem to be random chances, but both have been accepted as fixed drops.
Now I'm not saying that the amount of threads needed is bad, or that I want better chances at things. But rather that I just want clear answers. Like add a counter to pulls that you fill up as you pull and when it's full you get to do a super pull that will be one of the legendaries (like a Super Tendo Treasure), or for trial breakthrough get rid of that card "game" and just put the rewards in the chest. For threads (if it is true) just increase the number of threads it takes to do 1 try, and then have the growth rate go up or. Or just show our percent chance at things lol.