Nom, where else is the baal Shem tov mentioned as teaching to daven to a rebbe r”l? Even the Lubavitcher rebbe admitted he hadn’t seen it in sifrei chasidus, and that it was his own “feeling”
I also don’t know what you’re talking about with lakewood yungeleit. Please provide some non-chabad source for that, as well as his supposed relationship with the seridei aish. If his lomdus is akin to the mitztayer that you’re not mitztayer stuff, then I’ll pass on reading it.
Rav Moshe was.a great baal masbir; ever learn dibros? It’s very clear. Difficult, rigorous, but clear. he’s not the birkas shmuel. Who had a hard time learning with rav moshe?