Also, you will only learn his reasoning if you are in the sugya under discussion. If you learn his chidush, for example, that you need only have 40 hairs on payos harosh without the relevant gemaros, all you have is a sound byte of random information, but alas, you have “learned” his “rational methodology”, or according to the first poster, you have somehow learned torah lishma.
Torah lishma means you want to learn torah, and know it “al buryo” leshem shomayim, because hashem gave us a mitzvah to both learn and know torah. As a chabad chossid you should be familiar with the baal hatanyas shitah of the mitzvah of yedias hatorah, which he says is bigger than aisek hatorah. But that’s only if you know the dinim, as he explains openly. Knowing random words from the rambam without gemara-context or psak is arguably not aisek, nor yedias hatorah in such circumstances.