Tendonitis isn't like a broken leg. It wouldn't preclude him from walking, running, or jumping. It just hurts like hell when you run (hard) and cut. Him jumping up and down tells us nothing.
"Jumper's knee" is the most common form of tendinitis actually, so I highly doubt he has that type now.
As a LONG time sufferer of Pateller Tendinitis, which is what he has been diagnosed with, I can tell you that if it was bad at all, there's no way he would be jumping (after standing and cold) in celebration. That's like the one thing you wouldn't even think about. It's a simple "overuse" injury and the only real way to completely get rid of it is rest or "nonuse"....couple that with Portis' obvious distaste for the preseason and I'm not real worried. Also, in the NFL where cortisone shots are given out like candy, I can also vouch that a cortisone shot into the knees before a game would make it virtually pain free.My experience is from 5 straight years of pateller tendinitis resulting from college football and basketball. I would slide down all stair railings on campus because it hurt so bad to walk down stairs. I took every kind of ant-inflammatory daily, including stuff strong enough to need stomach medicine with it to protect the lining of my esophogus (sp?), had to ice before and after EVERYTHING down to half hour shootarounds, but in the end it was just a matter of putting up with the pain. As soon as my career was over, and I wasn't playing every day, it disappeared.Worst case scenario: Portis is in a lot of pain so he's resting it as that is the only way to get rid of it totally, then when game time comes he will ice the hell out of it, get shot up, go play pain free, then ice the hell out of it again and probably not practice until Thursday most weeks.Best case scenario: Portis has exaggerated the pain because he is a vocal proponent to limiting preseason games and doesn't want to play in them to begin with.Finally, count me in the school of "not worried about Betts assuming Portis is healthy".