Let me explain a couple of details.
1. Routing effects is a manipulation with routing parameters of the frame. It works on Cue level. It work on Master level. But, when the data (frames) is inside the Zone, then it is too late to change routing information. So, you need apply routing effect before Zone level.
2. "Also to" this is final processing that work after all Live Control effects and similar things. BEYOND take output of zone and distribute to/between "also to" zones. This is one way road without the loops. The frame can not come into one zone, then go by "also to" to the other zone, and then effect again and so on. This is one way road with fixed pipeline. Cue, Master, Zone, AlsoTo, BAM, Geo, ... something like that.
Regards,
Alexey.