Which Baine could not know at that time, maybe it was Magatha, maybe it was Garrosh, maybe it was both of them together. Considering Garrosh did not help Baine afterwards against Magatha's coup, a smart person would assume Garrosh at least knew of the poison and did not act on this to get rid of an old cow that was a thorn in his side.
Garrosh was many things, but he was not weak. Baine would not have stood a chance in single combat, even if he did trust the orc to fight fair and Sylvanas literally toyed with Saurfang, blocking a giant axe with a dagger and landing 5 hits before he had swung again. How in the world would Baine beat her? She beat the or a Lich King and an army of undead single-handedly.
I think you are just making up things now so your world view does not get disturbed by facts.
Theramore is Jaina's domain, she rules it as sovereign. Her decisions are what Theramore does. Even Varian did not get to tell her what to do. She cooperated with the Alliance plans because she saw the threat that Garrosh was.
I guess it is pointless, words to someone that fanatic are just a waste of time. Your blindness to all circumstances and facts that have been explained to you is becoming tiresome. No wonder Aucald gave up on talking to you. I'll not reply again, there is just no point.
Try thinking logical for once. An outpost that trains warriors IS a threat. Even if you do not know they are planning an attack. A gun held in your face is a threat even if you don't know that the person holding it will use it.
Ever heard of the Cuba Missile Crisis? Nobody knew if those nukes would be fired (in fact nobody wanted to fire them because nuclear armageddon and such), but they were a clear and present threat that had to be countered.