I'm not sure there is any difference in what sentence is being asked for each defendant. The article was focused on the local kid Davies, so pointed out what they wanted and what might happen with him. But from other accounts, it sounds like they each are being given the exact same deal. Since they did the same crime(s), why wouldn't they?
The deal is that a) they plead guilty, (b) the DA will make a
recommendation to the judge for a sentence of 123 months, within guidelines, and (c) then the judge will decide
whatever he thinks is best (which could be outside the DA limits).
The following quite is illuminating, and explains why there is mention of different possibilities.
"Prosecutors will recommend Davies be sentenced to the low end of the standard range, though [Judge] Quinlan noted he can impose a different sentence. The maximum term Davies and Yoon could see is life in prison."
Read more at:
https://www.thenewstribune.com/news/local/crime/article278867199.html#storylink=cpy
BTW It shocked me to hear these perps are being allowed to skate so lightly on such a cold-blooded killing. Only 10 years for breaking into a man's house, stealing his stuff, and murdering him? Goodness. If he was my family, I would be outraged.