In defense of Leanne...
I also thought she picked on Alexander unfairly and had an irrational dislike of him, but after watching them on Uncloaked I realised that:
A) they had a friendly relationship outside of the game related activities (which is only a part of their day and we see a small percentage of their interactions), Claudia saying she hugged him after every round table, etc.
B) he was convinced she was a traitor and probably went after her harder than we were shown. She got three votes at the round table when Linda was banished (more than Alexander ever got at any single round table until the final) and one was from him. If it hadn't been for Linda's time finally being up, she probably would've been in trouble. If she felt Alexander was instigating it, I can see why she'd be exasperated and suspicious of him. Not saying he harassed her or justifying her overreactions, but it adds context to some of her comments ("of course" when he wrote down her name, etc)
It's unfortunate for Alexander that he had to rely on Frankie who was the token useless faithful that gets dragged up to the final. I thought it would've been better for him to give his coins to Leanne as the one who doubted him the most, and challenged her to pick him, but that was before I knew how suspicious he was of her. Unfortunately, Frankie's gameplay was awful right up to the end, she didn't have the sense to form an alliance with him, which sealed both of their fates.
Minah had the right idea about the traitors needing to play as a team, especially now there are blind banishments in the final. Hopefully future traitors wise up to it and we see less recruiting for bait like poor Freddie.