Yes. Qbs were throwing to the open receiver..which wasn't Browns guy...that's the point
Not necessarily. It doesn't mean that the receiver Brown was covering wasn't open as well. If a quarterback has to get the ball out quickly, he throws the hot route or if he has time, he might throw a deeper pass even if the shorter route is open.
As I said, this statistic in a vacuum is not very telling. Completion percentage against a corner is a better barometer, but even it is faulty because the corner might be blamed for a completion that wasn't his responsibility because of zone.
I'd rather go with the eyeball test and what I saw from Brown last year was mostly good. He had a few plays where he bit hard on the double move and the receiver got way behind him, but he can clean that up.