There are 64 starting corners in the NFL. That's a mathematical fact. Tramon Williams was a starting corner in the NFL last season. If you're saying it's easy to replace Tramon, then you're saying that it's easy to find a better starting corner in the NFL. So, according to your logic, that means that Tramon must be worse than a lot of corners in the NFL, I chose 60 because it was a nice, round number. Go ahead and name 50 better corners. If it's easy to replace a player, that means there are lots of players that could play better than him. All I'm asking is for you to actually backup your statement.
As for your comment on me "not reading" about your stats, my fault, I wasn't clear enough in my reply. I actually did mention your stats in my reply but what I should have written is that you put no relative context around those numbers. You reciting random stats about one guy in the NFL doesn't tell anyone anything. Matthew Stafford threw for 4,257 yards, 22 TDs and 12 INTs...great, what does that tell me about how well he did compared to the other starting QBs in the NFL? Absolutely nothing. There's no context around the stats. Your statements about Williams lack any context.
I was also pretty clear about using PFF to rank Tramon amongst corners. If you want to look at how I rank defenses, go look at Football Outsiders adjusted defensive rankings, those are very informative (they actually take opponent strength into consideration). PPG is a very good stat but it doesn't tell all; what's more impressive defensively, holding the Packers to 14 points or holding the Raiders to 10 points? That last statement isn't a knock on PPG, which is probably the best indicator of defensive performance, but PPG does have some flaws.
It comes down to this. It's really easy to say a guy isn't very good when you aren't actually backing that statement up. All I'm asking for is for you to backup your statement that Williams isn't a quality corner in the NFL. PFF gives you, for free, an objective, comprehensive ranking of players at all positions. Unless you can categorically say that there are 50+ better corners in the NFL, then it must not be that easy to replace Tramon or else there would be lots of better corners in the NFL.