If an accused pleads not guilty it must go to trial. As I mentioned in an earlier post, I feel confident in saying that his counsel would have advised him to plead guilty. The reasoning behind early guilty pleas and plea bargaining is that court cases take up time and resources. If you plead guilty when your case is heard in court there may already be a jury empanelled, the prosecution will have wasted time preparing for the trial and witnesses may have had to come to court unnecessarily.
Further, an early guilty plea may also show that you have accepted responsibility for your actions and are remorseful.
Pleading guilty before trial can shave anywhere between 10-25%, and occasionally even more, from a sentence.
RH's counsel was caught between a rock and a hard place. He can't say anything to mislead the court, e.g. suggest things that his client didn't tell him, and basically is just ensuring that his client gets a fair trial and that the prosecution proves its case beyond a reasonable doubt.