Is the limit on Sleepwalkers holding spells per Mage or per Sleepwalker?

[SoulGambit]

Sleepwalkers can hold spells based on their sympathetic connection to the mage, which can be increased through a merit. If multiple mages, letd say one with a Strong connection and two with a medium connection, attempt to have the sleepwalker hold their spells, what happens?

Can the sleepwalker only hold two spells maximum, and its first come first serve? Is there a "Medium and better" slot and a "Strong or better" slot? Or can each Mage have the Sleepwalker hold spells based on their sympathetic connection, regardless of what other spells they are holding for other Mages?

[WHW]

Gut instinct, as I can't check it now, is "it's per Sympathy".

[Moinen]

See this thread.

[SoulGambit]

I don't think that thread actually answers my question, unless Im just not seeing it (which may definately be the case!).