Apple says it will take a team of engineers weeks to make these modifications. Bullsh*t. Probably several people who are intimately familiar with their code can make the change in a few minutes and recompile it.
The "number of tries" algorithm is likely a single subroutine. I doubt it has another back up section somewhere else in their code. Just disable the counting mechanism, or disable the instruction that tests for the number "10" and that's it.
Apple could modify this phone, let the monitoring computer "brute force" the password, get the data off it, and then put the operating system back the way it was before they gave it back to the FBI. No threat to anyone else's iPhones.
What part of the security passcode hash is built into the Encryption Engine, which is unreadable except from within the A6 processor of the iPhone 5c in question, do you fail to grasp, which you have been told numerous times in these threads? Oh, that's right you have decided you aren't going to read any of our posts to you and are just going to shout "LALALALALAL I can't hear you, because you are all Apple fanboy liars!"
You declare that "The "number of tries" algorithm is likely a single subroutine." Then you run with your unfounded opinion as a PROVEN beyond reasonable doubt FACT. It isn't. It's a "facturd" you've pulled out of your rear end, because you have ZEROl evidence to back your up your "facturd!" Just because DiogenesLamp declares it does not make it true. In fact, given your track record, it most likely makes it a lie.