We should be careful what we wish for.
Both sides and the judge had trouble finding caselaw about this. So, basically, HHBP will be setting precedents that will be used in other cases in the future. Because his decisions will be used in the future, he will need to take only the law into consideration (which he always does). HHBP will not rule with any feelings towards KC or the public outrage, since those feelings are not points of law. If he finds rules 100% in favor of the state, the aftermath will be prosecutors around the country will be attempting to place the costs of entire investigations on the defendants. I realize we want KC to be made to pay as much as possible, however, in future cases, it won't always be the most hated woman in America as the defendant. If HHBP rules completely in favor of the state, all the state would have to do in most cases in the future, is add a lying to police charge (which very often will be upheld in court, as it really does happen all the time), and voila, the state can spend whatever they want on a case and charge the defendant all costs. This may be oversimplifying the implications of HHBP favoring the state 100%, but, his decisions on this will set precedents for many cases down the road. I don't think these decisions are easy, or simple, and I think HHBP will do his homework on this. Don't be to disappointed if he rules that any costs after the indictment will not have to be paid by KC.
As always, my entire post is my opinion only.