Not sure about Texas family law (where he filed for divorce) , but generally, unless Kopech had a bullet proof prenuptial agreement, it would not make any sense to sign a big contract with the White Sox, where the income from that might be considered as marital property. Until the child is born, child custody and child support could not be determined or agreed upon. For these and other legal reasons I believe Kopech was well served by his father (I think I heard he was an an attorney) and his Divorce lawyer who likely advised him to resolve the Divorce, custody, alimony, and child support issues before proceeding with his career.
If this was only about baseball or even covid-19, Kopech would be here. I am sure he will be here next season, and he will be wiser and stronger, just like any of us become after we have to come back from the mistakes we all make in life.