The thing here is that you are assuming Matt's 40 time was a bad one, it is not. He will be just fine in his 10 and 20 yard dhases as well. It is other things that has caused his stock to drop.
Believe me I am no fan of Omer and have been on record about this for a long time, but there are much better examples of his short comings than the ones you are trying to highlight.