For the same criminal case you described, if the defendant entrusts three lawyers and all three lawyers defend separately, the court can assign the case to one of them to defend according to the specific circumstances of the case and the division of responsibilities of lawyers.
It should be noted that when handling criminal cases, the court should strictly follow legal procedures and regulations to ensure the fairness, openness and transparency of the case. At the same time, the court should also fully respect the rights of the defendant and the duties of the defense lawyer to ensure that the trial procedure of the case is legal, fair and reasonable.