Requiring one of Wright/Gohara/Soroka (comparable value to Sixto) for Machado is a non-starter, obviously. However, there is a chance the O's value a Braves pitcher much more than the Braves do, and a deal could make sense.
When we talk about hypotheticals with the O's, we have to remember just how terrible that FO is. It is safe to assume they have nearly zero analytical horsepower, and they are still living in the 90s (or maybe even the 80s). This the same team that gave Davis huge money for no apparent reason, and bid against themselves for Cobb to pay full asking price when nobody else was remotely close to giving him that kind of money.
They almost certainly won't be getting Sixto for a Machado rental, but the idea of lumping De Los Santos in with him as if they are even in the same realm of value is extremely telling. If they value someone like Allard/Fried/Wentz enough to take either as the centerpiece for Machado, AA has to strongly consider that move depending on what the additional pieces are.
Plopping Machado in the 2 hole between Markakis leading off and Freeman batting 3rd would make for a very potent top of the lineup, and likely improves the team by 2-3 wins over the final 2-3 months.