Actually it's 6. Marion, Gooden, Thomas, Humphries, Ross, Beaubois. All 6 except Marion (who was hurt) played tonight. But I'm sure that 7th guy is what really makes it tough, right?
And yes, if the 4-5, 10th place Spurs are contenders, the 9-3, 2nd place Mavs, who have a winning road record and have beaten the defending champs by 14 at their own place, are certainly contenders.
Keep telling yourself that. I think you'd have to roll into the beginning of this decade to find the last time the Mavs "couldn't compete" with the Spurs, even in the years the Spurs won championships.