No, this is not a valid concern. An attorney is ethically required to do his or her best for every client, regardless of how big or small the case may be. Your concern, if true would be to suggest that your attorney was engaged in a conspiracy to sell you out in your case in order to get a better deal for other clients. That is ridiculous.
Its really impossible to answer your question without knowing exactly what took place on the record. Judges are not required to follow the recommendations of the presentence report. They are only obliged to sentence within the guidelines and can depart with objective reasons stated on the record that are not already considered within the guidelines. He should either hire an attorney or request one be appointed for his appeal.
Probably nothing is going to happen by way of a criminal prosecution. It is possible that the prosecutor may be reviewing the matter. Just don't worry about it unless you are contacted advising youthat you have a warrant. If that happens get an attorney right away.
You can potentially be charged with whatever crimes they may have committed under a theory of aiding and abetting. Get yourself an attorney and make arrangements to speak to the authorities, or the people at the restaurant. Normally, I don't advise doing this, but if you are on camera I think its going to look much better that you are trying to get ahead of this and are being cooperative. You should expect to have to make a statement to the police and perhaps testify.
No. You have a right to travel but not a right to operate a car without a license. You can buy a horse or a bike. The state has a fundamental interest in guaranteeing that persons who are operating motor vehicles on the public roadways have demonstrated a minimal standard of proficiency; this is, in part, what a license demonstrates.