That was what my second reason was for his knees caving in, albeit in different terms. However, based on all the other problems he is having, I'm sure there is a lot more to it than just focusing.
No, he is falling forward before he even hits the bottom of the squat. This is not caused by a lack of driving with the traps, he has bigger problems than this. Honestly, he should probably find somebody to give him some pointers in person, lower the weight, and relearn technique as he needs a lot of work.
If you have a legitimate disagreement with me or have something to add, then by all means feel free to state your opinion. If you have a problem with me, my advice, Dave Tate, T-Nation, advice on T-Nation, EliteFTS, the internet, powerlifting advice given on the internet, sitting back in the squat, assuming (falsely) when somebody says "widen your stance" they mean as far as you can physically go, or are just trying to be a dick, start another thread about it, or just PM me and flame away. The muddying up of others threads just to proclaim your assumed eliticist status is getting old quickly.