It's not a matter of the cost. Generally an arbitrator's decision is final and can only be vacated by a court if the arbitrator abused his/her discretion (e.g., refused to hear evidence, was demonstrably corrupt/biased, exceeded his/her powers, etc.). That means, if he goes to arbitration and loses, the arbitrator's decision will be afforded the highest degree of deference the law recognizes and there are very long odds that it will be vacated. If he goes straight to court now without going to arbitration, however, he basically gets to try the case from scratch with no presumptions and no deference to the Benedict and Herbst decisions in their respective reviews.