Well, there are also a lot of descendants of Imam al-Hasan (A) especially in places like Morocco. It is recorded to have been said that if Imam al-Husayn (A) was killed, there would be no grandson of the Prophet (S) alive on the earth anymore, in the sense of the son of the daughter of the Prophet (S). This is true, as Imam Hasan (A) had already been martyred by that time.
However the line of the Imamate went through Imam al-Sajjad (A) so the line of the imamate would have been cut off in that way.
Anyway, it is a good question and demonstrates excellent critical thinking skills!
Many people traveled from Madina with Imam Husain (AS) but their numbers are not exactly known to us because we find in different books of history different numbers.
You can find some details on the website of mam Husain Shrine www.imamhussain.org
different sources depict Shimr Ibn Dhil-Jawshan and Sinan Ibn Anas as the killers of Husayn, peace be upon him. It is evident that both played a role in the killing although there may be some variations in the details of various reports. Both were fighting along the army of 'Umar Ibn Sa'd, sent by 'Ubaydullah Ibn Zayd, appointed by Yazid Ibn Mu'awiyah.
It is permissible to prostrate on a clay on which something is written, though it is much better to prostrate on plain clay ( Torbah) or Mohr or Sajdagah.
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