I've always assumed his quick turnaround against SHIELD was in fact heavily influenced by the personality imprints left by Hall and Quinn (or their trapped consciousness, whatever).

Yeah, like I said in my other comment, I just wish they would have portrayed it better if that were the case. When I was watching, it seemed more like they were trying to portray him as power-hungry and selfish, which I thought was a weird route to take Talbot. Sure, he liked to be in control, but that was usually for the sake of the US, him being in the Air Force and everything.

Maybe he's so much deeper in it that he's fully influenced without freaking out, all the various personalities have merged in a stable way.

I suppose that could be the case. I mean, it's all sci-fi mumbo jumbo anyway.