Avira,
what messianic Rabbi? Oh, a Chabad Rav who mentioned that Rambam learnt from anyone. No, he is not a moschihist, but rather a serious engineer in addition to being Talmid Chacham. And he did not say “learn Torah from Aristotle” but rather “accept empirical truth from whomever”, it was Muslim science in the context of conversation, but you are probably not aware what was studied in Fes madrasa when Rambam passed by there. Your ability to insult people l’hathila is sad.
I am not saying R Twersky mixes Torah and Psychology. He does a normal thing – applies Torah to the current reality. He happened to be a baki in certain area and does it well, in opinion of many people. I am still not sure what is your claim to knowledge here. It seems to be entirely self-circular: “I learned from Rabbi X and Y whom I think being most important ones, therefore, my opinions are most important because I am following those important Rabbis”. I am afraid you are insulting your teachers also.