First worry is you have to pass coverage. So if D & E are failing coverage on their own, the next logical step is to aggregate them to see if D/E combined can pass coverage. If so, then you have to test D/E combined for ADP and ACP. But, if E doesn't have a match, not sure how you can get D match to satisfy coverage. Prospectively you can make HCEs ineligible for match, but that doesn't fix the past. If E has a discretionary match provision, a match to E could make fix the coverage problem. If not, an 11g amendment that adds a match to E may the only way to fix.