> 1) For the Red-blue-green-star gathering in the ritual, it has to
> "do something to the star".  Katya can do a gathering with the three
> hegemons all right, but as far as I know, of the three of us, only
> Katya has any talents whatsoever that act on things rather than people
> or events.  

A bizarre squooshing gathering would be fine, as long as *some* part
of it does *something* to the star.  

> 2) With the same Gathering schtick: Katya can run a gathering that 
> squooshes talents that run off of different substats.  What happens
> if she tries this on someone with a talent running off a substat
> Katya doesn't have?  (The obvious guess is, it doesn't work, because
> everyone in the gathering has to hold down dice for each relevant
> stat...  Is it possible to use fortune for this?  In the analagous
> situation with the Deciders, Kith was able to do it with karma,
> but I think not with fortune.)

Your mechanic, as written, says that you get N dice, where N is the
amount everyone is holding down.  So by default, if you're holding
down zero Perception, then there's zero in the gathering.   

From the rules on fortune, you may only use fortune to up to double
your stat, so you can add up to zero fortune dice to your Perception
stat of zero, which is still zero. 

You may spend one karma to waive the "only up to double" rule, which
is what Kith did with the Deciders.  So in the end, yes, you think you
ought to be able to use karma to have a gathering with someone in a
substat you don't have.   

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I believe that the combination of 1) and 2) means Katya has the
ability to gather the 4 hegemons and get their signature into the
Star, presuming that this is something the Puce-Hegemon version of the
ritual calls for (which we don't currently know).