It is really not a substitute for Anti Estrogen. At 200mg, you should take Anastrozle 2-3 times a week. Most simply don't know what their estrogen sensitivity is initially. You can do just 25 mg of Proviron to boost and free the test.
Its true however, that when using masteron, proviron and winny you need less anti E and some may not need any dependent on their test dose. Now if using one of those substances with no Test at all, then no need for AI.