You're okay with Moss facing triple coverage because it means that "ANY NFL QUALITY PLAYER OPPOSITE MOSS" can get open against single coverage? (For the sake of the argument, I'm willing to accept the absurdity of this blanket statement). This offense is not dependent on, nor should it be the goal, to simply make it easier for the third best receiver on the team to get open when one of the all-time greats is an option. A receiver who is capable of forcing teams to respect the other deep half of the team would allow for Moss to work against "only" two defenders at a time.
1.) Moss had a "deep threat" receiver of the sort that people are raving about on his other side last season. His name was Donte Stallworth. Did that lead to a lot of double covering of Stallworth and single coverage of Moss?
2.) Having Gaffney, or any other receiver, 1-on-1 against an opposing cb doesn't guarantee they'll be open every time. However, they should be able to get open enough to be a net help for the team. Last season, the Patriots' brain trust clearly felt that having Gaffney (a non "deep threat" according to those making these arguments) across from Moss was a better match than having the "deep threat" Stallworth there on the way to setting the NFL record for points scored in a season. However, I'm sure that JSP, Metaphors and yourself know far more about what the Patriots offense needed and needs than that Belichick guy.
The fact that throughout the second half of the season and into the playoffs teams consistently double and triple teamed Moss, when we also saw an upswing in Gaffney's playing time, would seemingly disprove any claims of effective and consistent deep threat ability that you attempt to make regarding Jabar Gaffney, would it not?
I suggest a few things for you on this notion:
1. Go look at the numbers of both Stallworth and Gaffney for the second half
2. List all the players who "consistently" catch passes that are thrown 20+ yards in the air.
3. Compare the defensive abilities of the team played in the first half of the season vs. the second half, keeping in mind that the Chargers stunk until after the Patriots game.
He isn't a deep threat because the other team doesn't respect that threat, otherwise Moss wouldn't have to beat triple coverage as often as you think he actually does.
They do not need someone to run go routes all the time, they need someone who can, with some degree of regularity, beat an opponent, one-on-one, for a deep completion to draw the safety away from Moss's side of the field. Gaffney can take advantage of the intermediate and short stuff, but he doesn't make anyone else better and that is what this discussion is about. For you to argue that he does is ridiculous.
I didn't mention how often Moss beats triple teams, I merely noted that he does it and is defended accordingly no matter who is lined up as the other outside receiver. As for your degree of regularity argument, take the time to go look at all the #2 "deep threat" receivers of the other NFL teams and find out just how often they succeeded according to JSP's metric of receptions on passes that traveled 21+ yards in the air. You can find the data at ESPN.com
As for the discussion being about whether or not Gaffney makes anyone else better, where do you get the notion that such is the question?