To give the only canon example of a Rank 12, Labyrinth was ranked at Shaker 12 because the PRT didn't know that her power waxed and waned or that she had severe mental problems. In other words, if her power was always at max, and if she was always lucid, she'd deserve Shaker 12 in the eyes of the PRT.
So what does that look like in practice? Well, full power Labyrinth can change the environment for around a city block into whatever she wants within moments. Anything within her range is entirely at her mercy. Worse, she can selectively choose for certain people to not be effected by the altered terrain, so any allies she has are not harmed. In her case I'd hesitate to say that even a nuclear weapon would guarantee a kill - what if she changes the terrain in her range into solid tungsten or something before it hits? Any engagement where you interact with that power is already a loss.
If it doesn't meet that level of "well, we're boned" then it doesn't deserve a 12.
That said, we have more power as a Mover than anybody else alive, unless Doormaker's shard has a new host with all of his power. Part of what merits the 10 is our Blaster rating, too, as we can not only hit as many cities as we want in a matter of minutes, we could do so much damage that, as you put it, the PRT's response would "well, we're boned". Once they find out about Ragnarok, the combination of our Mover and Blaster ratings could push both of them over 10, into a range where the justified response is, "pray she doesn't go crazy".
Our Trump rating will remain low even with our ability to give out Templates, provided they never learn what IAE can do when at full power. We have a Striker rating in the form of our scythe, which while revealed to the PRT, and is likely in our file, we don't know the final rating. I'd think 3~5, depending on how they rate the intensity and cutting power of the blade.
Our Brute rating went up when we got Knight Armor, but I think we haven't suffered a hit strong enough for them to revise the "concussion and broken ribs from an RPG" that is the most damage they've seen us take.
I think Crescendo might warrant an extra point in our Shaker rating, but we're already rated high enough there that more than one point isn't justified. I suspect adding Singularity to that wouldn't add another point, and will as a result get dumped into the existing rating.
MM seeing our upgrades to PS likely got us a Tinker rating if she reported it, but she doesn't know enough to make a good guess at our rating there, and she knows the Protectorate is already downplaying our abilities to scare people a little less.
We rate a Master classification thanks to Samantha, who, prior to the PRT Underdogs program was unknown as a subordinate creation, might now be listed in our file. Her sheer power would be worth a substantial rating here, a rating that would go even higher if it were known that we can maintain two GBs. We can't create a second one unless Sam dies, so I hope we never get that opportunity, but I think it would still be worth an extra point for sheer power.
Wide Area Search and PS's demonstrated processing capabilities warrant a Thinker rating, maybe a 3 or 4.
Our Barrier Jacket warrants a Changer rating in addition to its Brute rating, but only in the 1~3 range.
Nothing comes to mind for ways to warrant a Breaker or Stranger rating, but we don't need those to have achieved "put your head between your legs and kiss your ass goodbye" as the official PRT response to us going crazy.
