This is a serious combination of problems and the outcome is entirely in the hands of the judge who originally sentenced him. That same judge gave him probation, then saw him violate it, put him on a GPS monitor as an additional condition, and then watched him miss a court date and generate a warrant on top of all that. Each of those steps represents a breakdown of the trust the court extended, and judges remember that history when a person comes back before them.
The most likely outcome is revocation of probation and imposition of whatever original sentence was suspended in favor of the probation. How much of that time he serves depends on the length of the original confinement charge and any credits that apply for time already served.
The failure to appear and the warrant are additional problems on top of the probation violation. Failure to appear can itself carry a charge, and the warrant signals to the court that he deliberately avoided the system rather than simply falling behind on conditions.
The only realistic path to a better outcome is a compelling reason for everything that happened, presented through a good defense attorney, and delivered to a judge who is willing to consider it. If there are genuine mitigating circumstances, life circumstances that explain the missed date and the violation, those need to be documented and presented persuasively. Without that, the judge has very little reason to extend leniency a third time.