Alright so I didnt really read the op but what I know is if your knee doesn't hurt or need a brace, don't wear one. If you wear one just because its safer (which really unless your going to get a super expensive one will not prevent you from hurting your knee. I mean, If your going to blow your knee out, one of those cheaper one at stores are not going to hold your knee in place so it doesn't) Also, if you wear one without a doctors recommendation or you have to, your knee gets dependent on that, and over time you will have to wear one full time because your knee needs that support.
Sparknotes: if your knee doesn't hurt then don't wear one and if you do, it will fuck you over in the long run. Trust me, my dads a doctor and we had a talk about wearing one and he told me all what I just wrote.