I've seen T write mostly good English on another site.

He can do it if he takes the time.

Well yes, like you say, a bit of that and some copy&paste from somewhere else. I could write a post now, decide basically what I'd like to say, then I could find a sentence that you wrote, another one from, Beth, another from SB..and so on. It does take a lot of work though. You have to be a dedicated linguist hahaha! Most of the boring posts written on other sides can be cobbled together in such a fashion. The thing is, can we believe he would go to the trouble? I do.