I think the trouble might be that L.A. intros aren't really much of an indicator of overall performance in the same way that a T.R. or Context intro might be. Since you're not meant to analyse in the intro, all we can mark you on is your general writing ability, and in that sense you've done quite well here. But there are plenty of people in the state who can write really fluently, but have no idea what they're doing in a language analysis.
The intro is basically just ticking off the author's name, the title, the context, the contention, some background info, and maybe the audience or tone where relevant. It's kinda tricky to separate a 7 from a 10 in that instance, because there's really not a whole lot an intro can do right or wrong aside from fulfill those criteria, and even they're flexible.
If you were planning on posting body paragraphs or little chinks of analysis, that might work. Even then, a part is often not representative of a whole, just like one essay isn't a perfect indicator of your capabilities and potential. I can understand the appeal of building up your essay piece by piece, but I'd say you're better off starting with some actual analysis, since that's where the marks in L.A. come from
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