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Howdy again! 

I can't seem to find any threads on this, and I don't see a clear answer in the codex. (Though, admittedly, I could just be blind as a bat )

The "Without Number" rule indicates that when Gaunt brood come back at the beginning of the Tyranid player's turn, they are "moving" back onto the field.  The Synapse/Instinctive Behavior rules indicate that anytime a Brood wants to move, it must first check for a nearby Synpase creature, or roll based on Instinctive Behavior.

So my question is whether or not Broods that are eligible for w/o# (and therefore not on the table) are required to make the Instinctive Behavior roll to move onto the board.  If a Synapse creature is on the board, no problem, they Fallback towards the nearest Synapse creature.  However, if no Synapse creature is on the table, would they simply fail to move onto the field at all, or do we assume that twelve inches beyond the deployment edge, some Synpase creature exists to say "Yeah, go there"?

Only broods that are not within 12" of a synapse creature must take an IB test at the start of a turn. Since it is impossible to determine the location of a brood that is off the table, I don't see any reason they should have to take the test.

More importantly, models off the board do not take leadership tests... period.