Went and took a look at some magic TP feats that don't involve the Eye and there are a lot of them. He says natural telepaths have NO defense against magic TP what so ever. Its like a backdoor against even the best natural telepaths. Even Galactus had no defense against magic tp. The Ancient One, taught Strange both magic TP and Natural TP, eventually was surpassed by Strange in those areas. Strange entered his physical mind mysticaly and literally physically flew around in it at the speed of light, reading neuro impulses and re arranged them. It was wild. Who else has done that in anyone's mind? But like I said, the eye isn't the source of his magic telepathy. It magnifies it as well as his innate TP, sometimes individually, sometimes both at the same time. But, imo the best thing other than magnification, the Eye renders Strange immune to all mental attacks/probes ever been attempted against him and when combined with both MTP/NTP it magnifies him to all but omniversal telepathy and awareness.