Re: Hormonal response.
All my reading suggests GH and T response to training is greatest for higher rep, lower recovery sessions (3x10r, 1min R 'better' than 4x5r, 3min R). The suggestion that Jon Edwards goes to max for a hormonal spike is therefore questionable.
THere are also a number of potential reasons for the acute increase in T due to weight training these include:
1. Reduced renal blood flow causing decreased metabolic clearance
2. Increased secretion from the Leydig cells or an alteration in testicular blood flow.
3. A decrease in plasma volume due to movement of water out of the cardiovascular system, this would cause an increase in testosterone concentration without an increase in total testosterone.