I agree that it matters how they are held and whether any common persons directly or indirectly have investment or other powers over the accounts.
However when you right a letter to management on behalf of all of the accounts, you convey that you are speaking on behalf of all of the accounts and have some authority to speak in that manner.
It would be nice for ECOS Management to let us know how many shares are outstanding and also, the number of shares of the Float. With 2 years of not reporting to the stockholders, many changes could have taken place.