I just think we all misheard Yoda (the first time, it would not be); he probably said "Always TOO there are, no more, no less." Too many Sith...Bel-Cam Jos 1 Minute Ago
Maybe it's off Shiv - spelling?
A knife you fashion in prison to kill others in the back by ambush attack?
And maybe that was
OK: Get this straight:
The Rule of Two was ALWAYS IGNORED!
But with it, there would be cause to only be FOUR (4) Siths.