Gustave was... interesting. I really doubt I have an idea of everything that's going on with him - especially considering he was targeted here, which I didn't expect at all - but fmpov, he was someone who was very unafraid of pushing hard for exactly what he wanted. Everyone who he liked kind of wanted to use him as a shield, because he'd push whatever vote you were doing hard and hopefully get it through, and if it didn't go through then he'd probably attract enough attention to be sent home himself instead.
Also from my point of view, though... he wasn't particularly careful or tactful with what he did, and he rarely considered other peoples' relationships with one another. More than once he came to me saying 'this is what you're doing' without actually consulting me about whether I wanted that vote or not, and more than once he pitched vote splits that relied on people being onside who blatantly wouldn't be onside (Richie in both Writer rounds, for example) - and he'd go to that person and tell them about the split vote immediately, before consulting anyone else on whether it would be a good idea. A lot of my own (and Oracle's) game revolved around doing damage control and trying to talk him out of doing things.
It's why I'm so surprised he was targeted here though. He's a big player, but he almost feels like a goat regardless? Maybe that's just my view on it though.