This may not be a very satisfying answer

.I don't think Umenyiora is matchup independent, but I'm more likely to play matchups with defensive linemen than most. I think it's very hard to reliably project which defensive end takes most advantage of their opportunities in any given week, so I tend to either (a) try to get studs on my roster, then (b) err on the side of others with the highest weekly upside based on opportunity (and talent). If I had Umenyiora and 2-3 other guys from the DL10-DL30 pack, I'd probably have Umenyiora in my lineup most weeks. Looking at this week's rankings, there's just no way I'm starting Derrick Harvey, Anthony Hargrove, Ty Warren and the like over a guy like Umenyiora. Jimmy Wilkerson or Greg White against the Packers? Yes. Cliff Avril against Seattle or one of the Seattle ends against Detroit? Pretty tough call. It's an upside and confidence thing for me. I know Umenyiora has 6-0-2 with 2 FF upside. I'm not convinced Darryl Tapp has that, even if his matchup is better.Umenyiora may have just 11 solos and three sacks, but he leads his team (according to the NFL statkeepers) with eight quarterback hits. Profootballfocus.com has him with 16 quarterback hits and pressures through W7, better than Justin Tuck's combined seven. The solo and sack stat lines for those two players would suggest just the opposite.Defensive end success is a fickle thing. Umenyiora is unfortunately one of those players (Peppers has been one in the past, too) that might flop against a well above average matchup and explode against a poor one -- and vice versa -- with neither event having 100% to do with how well he may have played.Just for your further reference, Umenyiora's main competition this week, Marcus McNeill, has allowed four sacks this season according to profootballfocus (none since W4), five quarterback hits and eight pressures (six in the last three weeks). Seems like a better one-on-one matchup that the overall numbers (which have SD as a below average matchup as a unit). Last week's competition, Jason Peters, was dinged, but generally a much tougher matchup within what's been an easier group to beat as a whole. Put one final way, I think I'd rank Umenyiora much higher than 30 in a "confidence-style" cheatsheet, but I'm not sure I'd be comfortable projecting him over a 3 solo, 1 sack week.