1.Poor technique
a.Lowering the head
b.Failure to wrap up
c.Not breaking down

2.Poor understanding of where/what he should be doing
a.Out of position to make tackle.....results in arm tackle whiffs
b.Leaves huge holes for big plays to occur
c.Over-enthusiastically over-running the play....trying to make the 'big hit' rather than a sure tackle

3.Lack of speed
a.Barely makes it to the hole in time
No time to break down
Arm tackle whiffs
b.Results in open holes in the defense and big plays

4.Lack of strength
a.Broken tackles
b."Drag" tackles



Having said that, again IMO, all BYU really needs to do is get a good pass rush. It's not just the lack of sacks, it's that QBs had so....much....time to find the open man. Change that and the D can be top 25 again.