At my university a lot of the 3000 level courses are taught by PhD students and those classes happen to be the smallest and where I’ve been able to interact with the instructor the most. But I’m worried that because they are still in the process of completing a degree their letter of rec might be seen as a weakness in my application even it’s a positive recommendation. If anyone has any insight on this that would be really great!

Would it disadvantage me to ask for a LOR from a professor from a different university who taught a course at my university that I took with her? She came to my university, taught a class one spring, and I really enjoyed her class and got a lot out of it but she isn't technically a professor at my university, she is a professor at another university close by. Can anyway take a guess on how that would be viewed during admissions or if it doesn't really matter?

I'm graduating a year early (in 3 years) and am wondering if that is something that I should write an addendum about. My university classifies me as a "third year" but I have the credits to graduate early and I'm worried that the third year classification may be somewhere on the application and may confuse the readers? Idk. Any guidance would be great!