Instead of spending money on one good pair of headphones, I have four or five pairs of headphones lying around in various stages of repair. One of them is missing a right earbud. Two of the pairs are the old iPhone model that never seems to stick in your ear right without hurting, particularly if you sweat (which happens to people when the exercise). I just bought two new pairs on Amazon for like $8 each, and I'm sure that within a couple of months something will be wrong with them. I'll put them through the wash. I'll lose them. One of the sides will sound worse than the other.

I don't know why I do this, but it does help me perhaps gain some keen insight into the mindset of Eagles coach/personnel guru/football genius(?) Chip Kelly. He is not a mediocre headphone collector (at least to my knowledge), but he is a mediocre quarterback collector. He already had Sam Bradford (been through the wash), Mark Sanchez (earbud missing) and Matt Barkley (on the cheap). But he just couldn't himself. Now he's added Tim Tebow (no stars on Amazon review) to the mix as well.

What could go wrong? Well, here's what ESPN Stats/Info says:

Tebow would join Mark Sanchez and Sam Bradford among the team's signal-callers. The three each rank in the bottom five in Total QBR among those who started at least 30 games over the last five seasons. Tebow ranks lowest with a 33.4 Total QBR. Sanchez is fourth-worst (40.4) and Bradford ranks fifth from the bottom (40.7).

Tebow's completion percentage (48 percent) ranks the lowest in the NFL over the last 10 seasons. All three quarterbacks tend to overthrow or underthrow their passes quite a bit.

Perfect. Kelly had a perfectly nice quarterback in Nick Foles. I have no idea why he would blow that up in favor of having four quarterbacks of questionable repute. Deadspin has some working theories — some humorous, some logical — for signing Tebow, but it doesn't explain the big-picture of just what Kelly is doing.

Maybe this is some grand experiment that those of us who never played the game (copyright) just wouldn't understand. Maybe he knows how to play to each of their strengths and turn them all into monsters in his system in various situations.

Or maybe he's just like me, figuring if you have a bunch of faulty options lying around, what's the harm in adding one more?