The best thing to bring is his categorization of Sufis into three types- which is known. I don't see why I have to quote it here in particular- you probably know of it if you're this well acquainted with his work.
The fatwa is interesting, thank you for pointing it out.
What I'd like to know is specifically which tariqas or groups in this time fall into his first category as opposed to the second or the third. I am simply asking questions; if you would like to answer them, then go ahead.
His views on Ibn Arabi' and Mansur Hallaj were certainly echoed by many, might I add.