Against Florida, Fillinger often went too far upfield and allowed himself to be kicked-out/took himself out of the play. He doesn’t seem to be doing that anymore. In the touchdown on the reverse, Fillinger squeezed on the block-down, and staid in position. He wasn’t athletic enough to stop the reverse, but it is a big ask to expect the DE to run with a full-speed WR.
Diabate either made a bad read, or was on a blitz, and crashed inside and took himself out of the play. Because Diabate was so far out of position, the tackle, who was supposed to block Diabate, was able to block CPIII.