That is why. I open the doors just enough, he has them wide-open.
Restricting yourself, restricting truth to a particular definition only serves to limit yourself.
Go on deeply indulging in the various devices, dropping any that do not work, and do not settle until it is your own experience. When you know, all scripture, all satsang talks look so poor. You will begin to understand the struggle these men have had in trying to convey this.
The Sufi's are great for a Western religious seeker, because fundamentally we identify religion with God. Especially the Universal Sufi movement, but many other of the less traditional (read, attached to the Quran) branches move the seeker away from a personal God to God as a more abstract idea. Essentially a Sufi teacher is taught "All is Brahman", but will see many names along with Brahman, all the names of God are included. Many Sufi's will tell you what is contained in Advaita is aligned utterly to Sufism, and this is not surprising. Such Sufi groups have grown around Hindu and Buddhist influences. In genuinely seeking truth, they have sought all material that might be of assistance - always with an eye to enlightenment. This is quite eye opening for the Westerner, it was my first exposure to the idea all religions are teaching oneness. Deeply, Sufis are teaching the merging of lover and beloved, the discovery of love itself.
What the Sufi's never provided was a direct device for realizing oneness, they are beautiful people, but mostly it seems to be all theory. Their practices are very accepting, but they fall short because identification ever remains. Everything is necessarily related to Allah and the Quran, but it is not so foreign as the Eastern religions. Knowing all is one, yet remaining a worshipper, was my first sticking point, a simple device from Buddha allowed me to see I was also included in the oneness of God. Yet, in realizing this oneness, the concept of God itself had to be dropped, God was the objective universe at this point, its opposite was the subjective universe, both had to fall together. This was the moment of enlightenment for me, the transcendence of duality happened in inquiring what now remained.
Osho has been instrumental for me since this initial enlightenment, although I do not recommend or even usually talk about him to those who have not at least glimpsed reality. He is quite dangerous, but if you can understand him he is beautiful. The principle role he has played, though, was seeing through the enlightened ego. As you probably noticed, I said "this was the moment of enlightenment for ME", ego returned. Osho helped me see certain things about this, to see this is the case with everyone, that it didn't make one special in any way. He provided the environment in which ego could be dropped, but of course Osho couldn't do it directly - part of the enlightened ego had clung to him.
Advaita has helped here, and it was an Advaita master which removed the ego. Without Osho, I think their teaching would have been more harmful, since essentially they would have been confirming my belief that I am God, never calling into question the idea or concept of what God actually is. I knew now what God was, but to assert this was absurd, it looks simply insane to say. My path still revolved around this idea until I encountered Osho, and without him I would never have understood Brahman or Sunyata correctly, I would not have recognized Nirvana. Yet it was an Advaita teacher that finally triggered this, and a few others have clarified further the language.
I suppose this is why I look more like Advaita than anything else, but every path I am aware of has been looked at honestly. I have not chosen what is truth, I have simply allowed truth to guide me. Now I am left with bliss, with no need for more, with complete contentment, yet a love that wants to be shared.