Customer upgraded AWS cluster from 4.8 to 4.9. All are update well but When checking the co/storage.status.versions, the AWSEBSCSIDriverOperator version is list but with previous version: 
$ oc get co storage -o json | jq .status.versions
[
  {
    "name": "operator",
    "version": "4.9.50"
  },
  {
    "name": "AWSEBSCSIDriverOperator",
    "version": "4.8.48"
  }
]

From 4.9, seems CSO doesn't report the CSIDriverOperator version, so the previous CSIDriverOperator version which is not correct should be cleaned up in such case.

upgrade from 4.8.48 to 4.9.50

Always

1. Install AWS cluster with 4.8
2. Upgrade cluster to 4.9
3. Check co/storage.status.versions  

[ { "name": "operator", "version": "4.9.50" }, { "name": "AWSEBSCSIDriverOperator", "version": "4.8.48" } ]

From 4.9. seems CSO doesn't report the CSIDriverOperator version, so the previous CSIDriverOperator version which is not correct should be cleaned up.