Man, some of you guys just have no ****ing clue how the NFL works. If the Chiefs want to sign another big-ticket guy they EASILY can. There are so many ways to "create" cap space if they're lacking. Convert $Xm of a guy's salary to signing bonus and BOOM, you have instant cap space.
Seriously,
if you don't know what you're talking about. They probably won't sign a guy because they've already signed 2 and you don't wanna overcommit yourself guarantees wise, but if they really like a guy at the right price, don't kid yourself that they "can't" do it.