I disagree with Lombardi.
You could say that the Patriots are one or two players away from being really good, but you could also say they're one player away from being mediocre. Take Brady off this team, and they're a 7-9 or so team.
The Patriots have a distinct lack of talent on both lines, and at linebacker. I think a lot of teams get in trouble when they start thinking that they're only one or two players away. Light is about an average LT (though I thought he might have graded out a little better than that this year), and Mankins and Wilfork are among the top players at their positions. I'd say Vollmer has some potential, but didn't improve much, if any, from his rookie year. The others are at or below average--some of the younger guys may have some upside (Brace, Pryor) but some of the older guys are getting worse (Koppen, Warren).
The best way to get two good players, as Lombardi wants the Patriots to do, is to draft five or six. For every Chung, there's a Wheatley, a Maroney, a Butler, etc.