Every person with a retained lawyer has the power to fire that lawyer by telling the lawyer that. You have a constitutional right to "counsel of choice," and this guy is no longer your choice. The court, however, has ultimately authority over it to insure the efficient administration of justice. Since the case is so far from trial, the trial judge should grant the motion for current defense counsel to be relieved.
The fact it was reduced from Agg Rob to Robbery is a big benefit. Why wouldn't he want to take the deal if he's guilty? Why is he taking legal advice from the inmates? In my experience, inmates think they know more law than lawyers, and most of the time all they know is rumor and supposition. What does his lawyer think?
You need to have this case go through juvenile so you don't end up with a "conviction" on your record. There is an expungement provision in Arkansas law, but it would not be wise to use your one this soon if you were arrested for shoplifting at age 17. In North Little Rock District Court, it is common to ban you from the store that is the victim, and just showing up there would constitute a trespass.
If the complaining witness has disappeared, the prosecutor's office may agree to reduce the bond to an OR. Don't count on the witness always staying gone. In addition, if the other person there knows her name and knows it happened, she could testify to the sex and the birth certificate would be admissible to show age. A disappeared witness here guarantees nothing.
Also, in Arkansas, statutory "rape" of a child under 14 is a strict liability crime with a 25-40 (at 70% parole eligibility) or...
Presumably you will get probation because this is a misdemeanor theft, less you have priors. Still, you need to have a lawyer to make sure you get the best possible outcome. If you can't afford one, the public defender will be available in the local District Court when you make your first appearance.
You should challenge the UA condition as a violation of the Fourth Amendment. There's no reason for it when the case is non-drug related. If he fails the drug test his bond would be revoked, and he'd be jail, but the bond wouldn't be forfeited.
How long ago did this happen? What was his defense at trial? Just the names are not much help, but it is a start. If two or more were involved in the robbery, how many were convicted? You need to find an experienced post-conviction lawyer to handle this, and it won't be cheap.