I answered his questions via a PM he sent me. But just to re-iterate what I said (paraphrased due to laziness
):
-The output required for a 5x5 is much higher than that for a 3x12
-Splits tend to stray into higher volume ("more is better") which is wrong
-There is alot of synergy with full body days. ie. Shoulders being worked on bench and rows even though they aren't direct shoulder movements (to name one)
-Much easier to progress with full body routines (5x5, 3x5, etc)
I recommend the rippetoe's starting strength (3x5) (same as Rabid Rabbit is doing)