Gizmo, your theory is not a bad one by no means, but there are a couple holes in it. First one is that /.'s rate has not dropped any since the appearance of PhF, so unless they have been skimming some amount of blocks off the top of there dailey rate for some time, they would not be able to start donating this amount of blocks with out us noticing.
Second, Decibel, Moose, Stats Guy Mike, and Leto have all stated that they have no reason to suspect foul play with any of these blocks, successfully blowing a hole in the "Lets give them bad-blocks so they get banned," theory.
What I would like to see though, if it exists, is slashdots distributed forum, it seams that TA and DPC interact with each others forum, and I know TA members have been into some of the other teams forums, such as HardOCP etc... But has either of these ever seen a Slashdot forum? If such a thing exists, it would be quite easy for the members of that team to organize this sort of dumping. But, it has always been my impression, that /.'ers were attracted to the team, not by the team atmosphere, but to be on a team that shares a name with one of the biggest geek pages on the net.
sorry for the ramble, these are just some of the ideas I have been mulling over the past couple of days.
strates