"Read the newly released report from Standard and Poor's.
This states that an independant Scotland would have a Triple A rating."

I read that as well where does it state that Scotland would be given a AAA rating from the get go? Rhetorical question it doesn't. All it says is that they see no reason why Scotland could not float its own currency, but that it would take time and it would cost. The following extracts are included in the report:

1: "The Scottish economy would face "significant, but not unsurpassable" challenges, if it were to separate from the rest of the UK"

2: " it cautioned that, while Scotland is capable of adopting its own currency, that it could "pose some initial risks to external financing". Specifically, we think Scotland would be hard-pressed, under a new currency regime, to quickly replicate the deep capital markets it enjoys today as part of the larger UK,"

3: "a newly-independent Scotland would be likely to face a shrinking economy if financial services, which account for 8pc of GDP, relocate to the remaining UK"

4: " Scotland may also be forced to reduce the size of its public sector workforce, which at nearly a quarter of the total population is well above the UK average, while Scottish companies which benefit from strong integration with the rest of Britain could also suffer"