I did some more reading an i get more of it now. So different enzymes are at work at different temperatures (beta and alpha).
So lets take two hypothetical brews, one mashed at the single temperature of 147 and another at 147 then 158 (i am just making up these numbers, but i think you get the idea). What, do you think, would be the difference in the finished beer assuming everything was the same (yeast, hops, grain, water/grain ratio, etc.)?