Quote Originally Posted by Alleo View Post

...or maybe Venat never planned to split the source apart since she only talks about keeping Zodiark in check...

On that point:

In the group discussion Venat does say -

"We must ask ourselves a simple question: are we prepared to pursue our chosen course, even should it mean suffering the eternal condemnation of our brethren? If so, I see no further reason to demur"

Wouldn't that suggest that they were very much aware of the consequences of summoning and considered the sundering as a highly likely, if not inevitable, consequence that they were willing to accept? For such a statement to then be followed up by the admittance that they were making the monumental decision even though very few agreed with it, doesn't show them in a favourable light right now.