I will bet the defense only puts on a small handful of witnesses. They don’t want the devastation of the past week to the prosecution’s “case” to fade down a memory hole and leave everything up to closing statements.
If the prosecution has really done such a poor job, I think it would be wise for the defense to put on NO CASE. After the prosecution rests, the defense attorney should stand up and say, “Your honor, the defense also rests. And we now have a motion we’d like to make to the court outside the presence of the jury.” The jury leaves. The defense makes a motion to dismiss. If the judge won’t dismiss the case for lack of evidence, the court decides if 2nd-degree murder and/or manslaughter will be considered by the jury. Then closing statements.
If I was the defense, I’d want to get this case to the jury as quickly as possible - if it even makes it to the jury. The prosecution isn’t even close to “beyond a reasonable doubt” in this case. They’re prosecuting Zimmerman because racists like Al Sharpton are demanding it. The 2nd-degree murder charge is such a blatant overcharge. The prosecution team deserves jail time more than Zimmerman does.