OAKLAND -- The proof was everywhere on Sunday, the details were glaring, and the proper pained conclusion was beyond question.

Terrelle Pryor isn't just the Raiders' best quarterback, he's the only one.

He's it, and Matt Flynn absolutely isn't.

If nothing else, the Raiders' gut-shot 24-14 loss to Washington at the Coliseum proved one franchise-focusing thing:

By not playing Sunday, Pryor loomed larger than he ever has and maybe ever will, and by playing the way he did, Flynn has never seemed smaller.

"Listen, Matt didn't play well and we have to move on," coach Dennis Allen said of Flynn's shaky performance.

"We have to get better from that, so hopefully we'll be ready to go for San Diego (next Sunday)" when Pryor is expected to be back.

On Sunday, Pryor was held out as a precaution after suffering a concussion a week earlier, and the result was a Raiders offense that plunged into a deep, dark chasm.

Of course, Pryor is far from a finished product and may not even keep this job beyond 2013. He's a wild-card, a dynamic question mark.

But for now, Pryor is the only quarterback who gives the Raiders hope, and Sunday the hope was not in uniform.

The care Allen and his staff took to keep him under wraps on Sunday is another sign: They can't risk damaging their best quarterback, so they kept him out Sunday.

So Pryor watched from the sideline in a black sweater, cheered wildly when the Raiders went up 14-0, and then was helpless while Flynn and the rest of the team imploded.

There were terrible Flynn throws. There was the egregious Flynn interception that David Amerson returned for a touchdown to cut the Raiders' lead to 14-10.

There were the seven times Flynn was sacked, some of them because of quarterback indecision, Allen said.

And there were boos from the Coliseum crowd -- constant, angry, loud and undeniable.

"Yeah, it's hard not to hear it," Flynn said. "You just try to focus on your job and do what you can. It's definitely hard not to hear."

Flynn's stats: 21 for 32 for 227 yards and a touchdown to Mychal Rivera to finish a great early drive to go up 14-0 after the Raiders had earlier scored on a blocked punt.

Then Darren McFadden and Marcel Reece both were lost to injuries, Flynn started getting swamped by the Washington pass rush, and the whole Raiders offense buckled and broke.

And the boos came.

"Yeah, that's not cool at all," tackle Khalif Barnes said of the Flynn cat-calls. "The guy puts in a lot of blood and sweat and he prepares hard and he works hard. It's never just one guy.

"I really don't like when that goes on. He's not the sole reason of what happened today.

"I could've done some things I could've done better. A lot of guys could've done some things they could've done better. We all take ownership. It's never just on one guy."

Sometimes home-crowd boos are silly and irrelevant. Sometimes they're just mean and reckless.

On this Sunday, the boos were the logical primal scream of Raider Nation: No more Flynn! (Who by the way is making $6.5 million this season and was brought in initially to be the starter. Whew.) Without saying it exactly, I think after the game Allen was essentially in frustrated agreement.

If Pryor can't play Sunday or if he is hurt again later, I think we'll see current third-stringer Matt McGloin at quarterback for the Raiders, not Flynn.

"Obviously, I don't think he saw the field very good today," Allen said of Flynn.

"I think he was obviously part of some of the sacks that we gave up in the game. It was a tough situation for him to go into, obviously with the loss of McFadden and Reece, that didn't help him out any ... Offensively we didn't get it done, and that's really the bottom line."

To his credit, Flynn stoically answered every question at his locker Sunday. But he still looked a little shell shocked and sounded washed out.

Did he agree with Allen's assessment that he wasn't seeing the field?

"I don't know -- I felt like I was seeing things fairly well," Flynn said. "I didn't think I wasn't seeing the field well. Just didn't make the plays."

He played, and no Raiders fan wants to see him do it again. Pryor didn't play, and the Raiders have to hope and believe he'll be ready Sunday, and into the future.

Because suddenly this whole franchise rides on Pryor's shoulders, at least for now. There is no other quarterback worth playing, or watching, or cheering.

Contact Tim Kawakami at tkawakami@mercurynews.com.