why not? the word Antichrist means in place of, so the Antichrist will come and proclaim himself the Messiah. so really what is to stop him from using that name? Even Islam is looking for a "Yeshua" to come back and help their messiah. And here you have Israel's chief Rabbi saying the name of the comming messiah is Yeshua... just saying...
Well, for one, Jesus Himself said that he (the Antichrist) will come in his own name (meaning not in the name of the Lord: Jesus' name means "Jehovah saves")
Also, using the name of Jesus doesn't seem like Satan's M.O. Satan wants the glory... all of it. I see the name Lucifer or Sol Invictus being elevated, not Jesus' name. Something that can be connected to all religions equally, not just one. This is where Zeitgeist comes in.
If they can convince everyone that aliens developed all of their religions based on an esoteric "cycle of astrological ages" around the sun and that each religion's respective god and messiah-figure is just a representation of the sun (which for every religion except Biblical Christianity can be alluded to), then everyone will get on the same page and worship the same individual as messiah of all religions.
Remember that theosophy, new age and Zeitgeist teach that the Biblical account of Jesus is done for EVERY savior of every religion. Jesus, to them, is just another one of the "solar avatars", and not unique or special. I see the Antichrist receiving his wound and dying on the winter solstice (Dec. 21, shortest day of the year) being dead for 3 days (Dec. 22-24 sun at lowest point in the sky) and being "resurrected" on Dec. 25 (sun moves 1 degree up), the day Romans celebrated as the "birth of the Unconquered Sun". Remember that the Saturnalia is supposed to mimic the conditions of Saturn's (the sun-star) Golden Age. One tradition about the Golden Age is that there were no laws. Aleister Crowley commented that in the Aeon of Horus "do what thou wilt shall be the whole of the law." Zeitgeist pushes the Venus Project run by Jacques Fresco. Fresco has for a long time advocated the idea of abolishing laws.
Wow! Sorry, I went on a tirade there. If I ever find time to put it into a cohesive post, I'll make a thread about it.
Anyway, Islamic prophecy has a tendency to be spiritualized. An example is the Dajjal: He is blind in his right eye but sees from his left. He is blind conservatively, but sees liberally (Barack Hussein Obama, whose name is 18 letters [18 = 6 + 6 + 6, but not six hundred sixty six], who the NWO is pushing to appear to be the Antichrist)
Didn't someone say that Catholic pope Francis is a "modern-day Jesus?" Muslims love him, too. I could see him as the sidekick to the Antichrist (whom they believe their false Jesus, Isa, will be for the Mahdi) It even fits what Bill Lambert said about the Catholic pope being a "proper receptor" to the New Age Christ.
All in all, it could just be that the rabbi literally believed Jesus is Messiah. I don't remember too much about that story, just that he wrote it on a napkin or piece of paper and they couldn't read it for a year.