Here I found an interesting article, that gives some specific info about Trichoderma...
"***"Don't use trichoderma in dry soil. Moisture is a essential factor for its growth and survivability.
Don't put the treated seeds in direct sun rays." ***
They also talked about the T. growing right along side the pathogen excreting the toxins or wrapping around the hyphae of it... So there it could be assumed that the idea of too much water creating an environment for the pathogen would , not inhibit the T.
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage,,, I wonder what does...