Well, Coleman has missed more games due to injury (4) than Worthy (3), right? And that's without having an oaf of a teammate run him over. So that takes care of the "best ability is availability" argument. Very basically, for the other poster to say "well, what's Worthy done the last three weeks," is incredibly lazy. And inapposite, for that matter.
I like Coleman--a LOT. I want him to succeed. But he isn't the better player right now, and I'm certain that I'm not the only poster who thinks the Bills helped out their big rival in the AFC with that trade a couple of years ago.
EDIT: I want to add: Sheer skill on the field is not what makes a player best for the team, and Coleman's personality is by far the better fit for the Bills. His cookie-eating, Macy's coat-wearing dorkiness fits so well with a QB who draws a buffalo that looks like a potato and plays Catan. So there's that, too.
But to point to a guy's three weeks of injury and say "scoreboard!" as if that's the end of the argument, is intellectually dishonest.