I think you are confusing proxy votes from owners at general meetings and proxy votes from other EC members at an executive committee meeting. In an EC, it’s one member, one vote – no owner proxies or unit entitlement poll votes. However, you can have proxy representation of an absent member of the EC, but only provided the EC agrees to it.
Some EC members try to use the proxy votes that got them elected to the EC to wield more power at the EC – this is not allowed. Like I said, EC votes are one member, one vote unless an absent member gets another member or another person to represent them … and that have to be approved by the EC..