Amir Coffey just made several Bucks expendable (no one is safe)

Boston Celtics v Los Angeles Clippers | Katelyn Mulcahy/GettyImagesHaving signed Amir Coffey to a training camp deal, the Milwaukee Bucks don't have to make a roster decision immediately. Make no mistake, though, several players should be feeling the pressure this preseason. If Coffey looks like the guy who just had a career year for the Clippers, now or later, the Bucks will have the option to part with a number of backend rotation pieces at the wing position. That flexibility should not be underappreciated.

Coffey's arrival makes final roster shape more fluid than anticipated

Even before the Coffey signing, Andre Jackson Jr. and Chris Livingston clung to the fringes of the rotation. Because…