The difference between a Perpetual Garden and a Perpetual Position is that in a Perpetual Garden, people follow each other unconditionally.
In a perpetual position, you have the ability to fill your Garden yourself with your guests, so you are not basically helping the primary Gardens for the simple reason that when you are going to invite someone, they will arrive in your Garden when you are in a perpetual position, whereas if you are in a perpetual Garden, that is the position you are going to invite. The person you are going to invite will leave in one of the primary Gardens and up to the 15ᵉ generation of guests.
The great thing about the art of the Perpetual Garden is that people follow you unconditionally. That means they follow you to all the Gardens.