Anyusername, I finally got hold of a שדי חמד and found the source you are citing. What does this have to do with your manner of “explaining” (read: distorting) the Gemoro and saying that in Sanhedrin 98b it says that a dead person OTHER THAN DONIEL can be Moshiach.
Furthermore, allow me to quote the Sdei Chemed in that very section:
וצריך להיות בכל דור הא’ הראוי אם יזכו הוא יהי’ השליח ע”י אלי’ ואם לא יזכו יהי’ כשאר הצדיקים בלא הפרש ובמת ר”ל אחד צ”ל אחר בדור במקומו שיהי’ ראוי ע”ד דאמרו בקידושין ע”ב וזרח השמש ובא השמש כו’ יעו”ש
Note: the Sdei Chemed says explicitly that if the person of a generation who was suitable to be Moshiach DIES (he does not say “killed” as many lubavichers try to claim based on the lashon of the Rambam) then someone else in the generation takes his place.
So if you believe that the lubavicher rebbe died, then according to the Sdei Chemed (the edition I’m using is published by none other than the lubavicher publishing house which at the time was under the direction of the then future, now late, lubavicher rebbe, who even signs his name at the end of the introduction) you have to believe that someone else alive is the suitable candidate. And if you believe he is still alive… you are at best a looney and at worst an apikorus.