Wait I am sorry I am a bit confused I might have missed a few pages since I last read so the scroll has a lock out requiring you to put in a certain number of lets say tier 1 before it allows you to add in a tier 2. But at the same time it allow you to input a tier 2 it locks out tier 1. While that trade is going on the failure rate climbs and for each failure the rate of melding approaches 100% success rate again. So my questions are:
If let say your on the teir 4s of Determination (Det) and you wanted to add Skill Speed (SkS) as your next stat could you start SkS and then then come back to Det when you get your next Det. And if so does SkS start at teir 1s or at the current cap for the other Materia fused stat?
If you fail on teir 1s does the success rate increase the same as if you failed on a higher teir?
Are the success rates shared between stats so I can risk a cheaper materia Sks to increase my success rate high enough to try the more expensive DET?