Yall are failing to take 2 HUGE things in consideration when you criticize the defense attorneys approach to this case: 1) the Rules of Evidence and 2) Trial Strategy.
First, with regards to trial strategy, West brilliantly slow walked the cross examination of the DNA witness in order to prevent Trayvon's mom from being called to the stand today. He stalled b/c you don't want that emotional testimony being the last thing the jury hears before getting a full day to think about it. I knew he was going to try and go long enough to prevent the State from resting their case today, but I didn't think he could do it - should have never doubted him. Huge win for the defense by delaying TM's mom emotional testimony until Friday morning.
Second, with regards to the Rules of Evidence, the Defense can't just ask anything and everything on cross-examination. They are limited by the scope of the State's direct. So, that's why he had to ask about Stand your Ground b/c (if I remember correctly) that's what the State attorney asked about on direct. This serious of questions was also very smart because West got a chance to give the jurors a lesson on the law of self-defense. Also, you want to lead the witness on cross, not ask him for a narrative response (plus this would be objectionable).
I hope this helps explains some of the things you don't understand. I am by no means an expert in criminal law nor the rules of evidence, but this stuff is tricky even for lawyers/judges to fully understand, much less lay people. So don't be so harsh on the defense or the prosecution because both sides are very experienced and usually have a method to what seems like their madness.