I know this was often a topic of complaints on Sundeck but I don't know about here....can someone tell me if I am missing something on what happened tonight?

I can't figure out any reason why a double switch was helpful after the 6th inning. 2B Valdez had just hit. P Leake was up next. With Leake being replaced by Marshall, Dusty double switched and put Cairo in the 9 hole (Leake's spot) and Marshall in the 8 hole (Valdez's spot). Well...unless you are leaving Marshall in for more than one inning, there was no danger of him hitting in the 9 hole anyway. HE WAS ABSOLUTELY NOT GOING TO HIT AND WAS NOT GOING TO PITCH IN THE 8TH INNING. With that being the case, you could have just left Valdez in the 8 hole and pinch hit Cairo for Marshall in the bottom of the inning. Saving a field position player in a possible extra inning game.

Can anyone explain why a double switch was helpful there?