I would not say you are crazy, but I also think you are greatly overvaluing Brown's history here.
For his entire career, until last season, he was the second option. Last year, he become lead dog, but did not really figure out how to be productive in that role until the second half of the season when he really went off.
Brown's numbers against the Ravens are more a product of his past role than a sign of things to come. I would start Brown with confidence in this one.
I can see making that move, it's not like Garcon is a horrible option this week. Plus Antonio Brown plays in the dreaded Thursday no offensive production game. However if it was me I still couldn't sit Brown just because the Redskins offense has looked too horrible for me to play anybody there regardless of whether Cyprien plays or not.
10 catches for 77...DJax another 8 for peanuts, no scores between the two of them. RGIII averaging 7 yards per attempt.. The volume is there but the points aren't. I'd start Brown against Seattle even if his history was 1 catch in 10 games over Garcon, just because I know Big Ben doesn't have problems throwing TD's
I'd go with Brown still. Any volume Garcon gets can be matched by Brown. Although points may be harder to come by Thursday @Bal, Washington's potential for points should lean toward Alf and DJax, IMO.