I say this every year when someone tells me that "so and so" is going to beat a former Professional Motocross Champion, it's not going to happen. Brown is OLD for the class, but he still has that something that made him the BEST in the world at one time. You don't have that and get beat by a regular guy unless you have a mechanical failure or get caught up in a pile up. I bet Brown wins both +25 and +40, harder time in +25 (like last year when the old guy wore out the young buck and left him winded in 2nd place muttering to himself).
Grewe on the other hand has gotten better with age, he is better now than he ever was a professional and he just keeps on winning. Last year he lost a moto to Carsten when he got knocked down and broke his wrist (still finished 2nd in the moto), but he won the war. I don't think Carsten will beat him for the title but hoping for good motos between them.