Is mineral deed required as well as affidavit

My mother inherited mineral rights from her mother who inherited them from her mother’s mother because they are cherokee. Interests lie in Pittsburg County Oklahoma, two parcels, nine Wells. She left a will, signed and witnessed, sitting my name is the person inheriting those rights. We did not probate the world because there were no assets and the cost is not worth it. She was married at the time she died, I left my brother and I as the only surviving children. We were notified by two different operators of unclaimed royalties it’s got the ball rolling on transferring ownership out of my mother’s name to my brother and I. We filed an Affidavit of heirship, a death certificate, and a copy of the will with the county clerk in Pittsburgh county. Oklahoma. We then provided a copies of the recorded documents and W 9s to the five operators. We are starting to hear back from them. We’ve heard back from two, one is saying that will have to split the interest between myself, my brother and also her husband. Equal thirds. Unless we have her husband sign a mineral deed conveying his 1/3 interest over to my brother and I which we would split equally. The second operator let us know they will be sending equal checks to my brother and I after they received the copy of the affidavit, death certificate w9’s Etc. No mention of the need for a mineral deed. To this point I’ve done everything myself, and put in hours of research to make sure affidavit was filed properly, and lots of time locating Wells and operators and notifying them as well. Just a lot of time had a lot of learning, but that part is done. Question is, is that correct, her husband is entitled to 1/3 of her interest because we didn’t probate, even though it’s Indian related, or is the second operator correct in going strictly off of the affidavit of death and heirship?