Should a lawyer who executed and drafted a will but said he only kept copy of unsigned will be able to testify?

would this lawyer who has doented history of trying to get descendants property from her be allowed to testify in trial? (we have copies of the letters that he sent to descendant, yet our lawyer refused to question him about them during trial) This lawyer also has been on the secret judicial misconduct list. The descendant also as he stated in his deposition was a neighbor and a friend, yet he supposedly sent a 74 year old woman home with the only signed copy of her will. He also stated in his deposition that he contacted lawyers that he knew descendant had contact with to find out if she had made out a new will. How would he know what other lawyers the descendant would have had contact with. He also wanted to be notified if we found a signed copy of descendants will in her personal belongings. Does this sound fishy to anyone else? Do you have any suggestions?