Insurance costs more expensive than needed to manage risk. Find cheaper solution.
Some risks must be managed in another fashion than to have a backup for every possible contingency. There is currently no indication that Marshall will even be charged with a crime let alone suspended. There's no need to anticipate something will come from this unless charges are brought. To date they haven't been and it appears unlikely that they will be. The draft is over a month away so there is plenty of time to prepare contingency plans should the need arise.
Marshall's issues with domestic violence appear to stem from his BPD for which he has received treatment and continues to do so. He is fully aware of his disorder and the problems that it can cause. There is a reasonable assurance from him and his doctors that these problems will not be repeated but this cannot be guaranteed. The team is also aware of this and has chosen to accept the risk involved with this.
Some risks must be tolerated in this case. The cost of a standby 100% replacement is too costly at the present time given other needs and in no way assures the same level of performance as that which it replaces. An alternate and less costly solution should be sought.
There ya' go. That's how I'd write my analysis for you if you'd asked.