The Chiefs are using the Raiders facility because they're the designated home team, it alternates each year, one year the AFC is the home team, the next year it's the NFC, last year the Eagles were the home team and got to practice at the Cardinals facility, the Chiefs were the road team and had to use ASU's practice field, both teams can't use the same practice field, like I said, they alternate each year, the Chiefs getting the Raiders facility isn't some sort of grand conspiracy, someone tell the Niners to man up and stop whining about the field like little bitches