Mystery Member of the Garuntee Group

[Anna Simpson]

I've always known there to be 9 members of the Garuntee Group. However, I came across a tenth member, Joey Thompson on ET's list of those who boarded Titanic at Belfast. But, on his biography, it is said he disembarked at Southampton. Why is he a Garuntee Group member, then? And, if he is, then how do you explain the ten members? Did Thomas Andrews not count as a member?
Thompson bio:Mr Joey Thompson - Titanic Passenger
I'm new and also very confused. Please clear this up for me.
-Anna

 

[Anna Simpson]

Here is the list of those who boarded at Belfast, in case you couldn't find it:RMS Titanic :: People that embarked at Belfast

 

[Ioannis Georgiou]

Joey Thompson was not needed on the maiden voyage. He made the voyage from Belfast to Southampton as a painter, doing with his stuff the last work on the ship.
Including Thomas Andrews we have 9 members (without him 8) of the Guarantee Group. I guess it depends on how someone count them. I think in many books you will find that they were 8 members working under Andrews.

 

[Anna Simpson]

Thank you. that was very helpful