Conditional column evaluation on grouped data to maintain a distinct list

Bumping and adding new code as I am getting closer but I've again run into the edge of my knowledge.

I am producing a table of distinct wireless numbers and then selecting the appropriate employeeID to return and then relating that back to the AD data to produce a name and other information.

Here's where I am:

{"Wireless Number"}, 
{
{"Items", each _, type table [Wireless Number=nullable text, GetBaseUserInfo.displayName=nullable text, GetBaseUserInfo.Custom.extensionAttribute15=nullable text, GetBaseUserInfo.UserStatus.user.userAccountControl=nullable number]}, 
{"Count of Users", each Table.RowCount(_), Int64.Type}
,{"EmpID", 
    each 
        if Table.RowCount(_) = 1 
            then List.Max([GetBaseUserInfo.employeeID])
        else if Table.RowCount(_) > 1 then
            each if [GetBaseUserInfo.UserStatus.user.userAccountControl] = 512
                then List.Max([GetBaseUserInfo.employeeID])
                else List.Max([GetBaseUserInfo.employeeID])
        else 0, Int64.Type
    }
}

I feel like my issue is getting closer to resolve but the step where I am trying to look into the grouped data to find a value seems to produce an output that says "Function".  Obviously I am doing something wrong, so perhaps someone can help correct me.

The logic I want is if the rowcount is 1 then give me the empID.

If the rowcount is > 1 then give me the user empID where the status is 512

If the rowcount is > 1 and there are multiple 512 users (this case exists currently due to user error) then give me the user with the higher empID

The else then is if the rowcount is > 1 and there are no 512 users then give me the 514 user with the highest empID

Please help with any insights or tips on how to properly perform this set of nested if statements in this language that I don't fully understand. 

Thanks