Dealer's Table Assistants + A Tax Question

I vaguely recall reading one time, somewhere, that a dealer could only have an assistant with them if they were in charge of a whole table (or more.)
The logic behind this was that there are two chairs behind each table, and there aren't allowed to be more than two chairs behind each table. So one could only have an assistant if they were the only one at the table.

It's possible this is not true at all, because a vague recollection is not a very good source...
And that is why I'm posting!

Is this true? Or can someone with a half table also have an assistant as long as they don't mind the space and breathing-room restrictions involved with having three people at a table? (provided the assistant fills out their tax form and follows the rules, etc.)

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And also, the new tax form... I filled one of the old ones out and mailed it in in the beginning of November, the same time i sent in my dealer's packet - and i still haven't heard back from them about it. Now that i have my table assignment, i only have so much time before that gets forfeited if i don't provide a number. Should i fill out one of the new ones, or would that only complicate things?

I was a dealer in 2005, but i don't remember what my number was... and so this time i signed up for a tax license as a first-time vendor. Is it possible this might throw a wrench between their gears?

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And that's it, for now! Thanks. ...Apologies for my semi-long-windedness.
-ecm