@glgrady1015 it can be assumed the “extra” cells were saved just in case a DLI was needed.
My husband needed a DLI six months after transplant due to incomplete chimerism. There were no cells left over after transplant so our anonymous donor was very kind and donated again. What a blessing.
The DLI was a tiny amount of material and was done quickly as an outpatient procedure, but we did need to come back the next day to get bloodwork and see his transplant doc.
The DLI was successful and he achieved complete chimerism within two months. He did develop some GVHD at that point, but it was closely monitored and well managed by the team.
Best of luck to you and your husband. Every day is a wonder for us, and may you have many many good ones ahead.