Gladly.
My first point is rule simplicity- if I could produce the desired 'style' or theme using existing core rules and Special Units/Abilities this was desirable to producing new special rules for the same effect.
To this end I could have added more special rules about Synapse-less formations disappearing at particular points in the turn, etc.
Alternatively I could make the existing rules (and the other Tyranid Special Rules I added) do the work for me- by making a Synapse-less formation one of the most useless things on the board.
-They can't claim or contest objectives.
-They are no longer Expendable.
-They gain no bonus +1 for Engage or Rally.
-They can no longer respawn stuff.
They become dead weight, as close to roaming feral Tyranids as I could get without adding new special rules.
In the rare circumstance my Synapse was killed off with Brood creatures still around they spent the rest of the game Broken, failing to Rally.
Yes, you can move Synapse units from another formation into range to regain some of the benefits- Synapse controls every Brood creature that comes into it's range. The downside is you'll have intermingled formations, and if you want those Synapse-less formations to stay in Synapse range they'll have to leapfrog amonst Synapse formation or Retain alongside them. It's almost not worth the bother and slowing of your still Synapse led formations.
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Seeing as how this is *remarkably* similar to the experimental rule I posted from the Phase III list, I really don't see where your complaint about "long range" Synapse control is coming from.
I don't recall the Phase III list, but I have stolen most of my unit stats, and rules, from the V9 lists. I'll take the hit on that one- as I've said before a lot of the work in there is great, it doesn't get lauded much because the internet is for criticism not praise. There's not much mileage in "Oh, that rule is super awesome", "Yeah it is", but a lot to be gained from "I think this is wrong, here's why", "Oh, really I disagree, here's why".
If you want to take credit for other stuff in Splinter Fleet Churoninx or state those ideas have been tried years before, go ahead- according to TacComms every idea was done years ago.
I just wanted to use an Epic Tyranid army I enjoyed against my friends.