Sorry, but none of your so called evidence proves in any way that Olivia is lying to Kane and Seth.
That is actually one thing Gregors does have correct, or, if we are playing the semantics game...maybe not so much direct lying (you cannot lie if not asked a direct question) but there is certainly a rather large slice of being very conservative with the truth (examples being she knows Kane is not her brother, she knows Callista is alive (proved in this update) etc etc.
However, what Gregors fails to relise is (and you
do understand) is that despite Tess saying she would not have made the VN without Olivia (as a playable character, and it would be interesting to know how that worked in her original story), ultimately Olivia really doesn't matter all that much (currently at least), she is a peripheral character at best that we can make some choices for...
Alexander has 6 daughter's...anyone one of them can get pregnant by Kane....the only character that actually matters. The fact that 90% of choices and decisions are Kanes, the fact that there are 197 flags relating to Kane (Dom and Sub combined) and only 39 for Olivia is also very telling. It's a very similar disparity with regards to Relationship points also.
So sure, Tess may have wanted Olivia in the story and to make it a multi-protag VN for her own reasons but there can be no denying, Kane is the main character, always has been, always will be. Without him, there isn't even a gambit to begin with is there and any number of women can fulfill the gambit with him.
Where she becomes more important is in her feeling Kane out for own desires and ambition. She is always testing him, always seeing if he can be the man she needs and wants...and as the other (main) sisters understand, Olivia has a massive head start over them...hence them being far more willing to 'have sex' than Olivia is. Right now, Kane being being on her side/same page is far more important (proven again in game) than any actual romantic relationship. She doesn't need to...and anyone who thinks 8 days is a long time and doesn't see that Olivia is picky (we know of at least 2 confirmed men she has turned down) is a deluded idiot.
it's also entirely possible that Olvia
knows full well that Callista
wants her to be with her son. If make the right choices, you can even gain a '
WorthySon' point with Elena, getting her to also believe in this specific union. But ultimately, there are still 5 other daughters of Alexander around who can all fulfill their fathers wishes.
Olivia, just isn't as important as some want to make her out to be (story/plot wise) in the grand scheme of Alexander's desires (until we get more info regarding exactly what she knows).