Question 1.
I think that the problem statement or “mission” might mention additional pain points, data use cases, main stakeholders in this.
So something like:
“Making use of data is key to using the Ethereum network, whether it originates from the blockchain itself or from other sources. End-users, dapp developers, and network operators are stakeholders in valuable data use cases and this Ring aims to understand and address their pain points.”
Question 2.
As for side Rings … side is better than sub 
… perhaps let’s see which of these further topics stick.
Query Interface / Underlying Data
Provider Infra / Running Nodes
Oracles / External Data
Data Verification
Question 3.
Yes, but as with the others, we need a champ.