@Shogun you’re making this hard on yourself. Just simply ask yourself, do you believe Sayed fadlallah (ra) is the most knowledgeable marja’ out of all the maraji’? If you really think so, provide reasons and proof, if not then you must follow a living marja’ that is the most knowledgeable.
Imam Khamenei and Sayed Sistani have the most ahlul khibra (scholars) that vouch for them (according to common knowledge) out of all the living maraji’ today. This means choosing between one of those two maraji’ is a good enough reason to consider them as most knowledgeable.