Wow, no, you're way off base.
The 948 is just the number that showed after the 205. 948 has no relevancy to the sums part of the workout. The theory behind this system is that when a number shows (948) after the sum we're looking for, which in this case happens to be (205=7 sum), I'm assuming that whatever controlling force is behind 948 showing after 205 can be broken into sub-parts, which is why I divide it down by 2 until I get to a two digit number as in 23. 23 is sort of like a small representation of the larger whole/building block of the "Controlling Force" mentioned earlier. Basically It's like taking apart a piece of skin down to the molecular level to see what makes it tick/or what pattern it's currently in. Then when you find the PRIMER, you hope that it will continue to leave it's trace/fingerprint for about three more days or so, until the primer changes. After the three days, you do the whole process over again with whatever the winning number is 3 days later.
You subtract the 205 from the 948, which gives us 743. Then divide the 743 by two until you reach a two digit number close to 28, which happened to be 23, because the next step up would be 46, and that's too high. You could try 46, it may work just as well.
Then you go back to your original number 421=sum 7, and keep adding 23 eight times.