Imam Jafar (as) Could Not Even Find 17 Imami Shias During His Era ?

I posted this clip a few years back, and now I found a reference to the above clip.

H 2311, CH 96, h 4

Muhammad ibn al-Hassan and Ali ibn Muhammad ibn Bandar have narrated from Ibrahim ibn Ishaq from ‘Abd Allah ibn Hammad al-Ansari from Sadir al- Sayrafi who has said the following:

“Once I went in the presence of abu ‘Abd Allah, recipient of divine supreme covenant, and said, ‘By Allah, it is your obligation not to sit (without proclaiming your leadership).’ The Imam asked, ‘Why O Sadir?’ I said, ‘Because your friends, Shi’a (followers) and supporters are so many. By Allah, were Amir al-Mu’minin (Ali ibn abu Talib), recipient of divine supreme covenant, to have that many Shi’a (followers) as your Shi’a, friends and supporters, no one of the tribe of Tamim or ‘Ady could dare to disturb him.’ The Imam said, ‘O Sadir, how many do you think they are?’ I said, ‘One hundred thousand.’ The Imam said, ‘One hundred thousand!’ I said, ‘Yes, in fact, they are up to two hundred thousand, and I said, ‘Half of the world (population) is your Shi’a.’

“The narrator has said that the Imam remained calm and then said, ‘Is it possible to come with us to Yanbu’?’ I said, ‘It is fine with me.’ He then asked to bring a donkey and a mule already saddled. I hurried to ride the donkey and he said, ‘O Sadir, can you consider to allow me ride the donkey?’ I said, ‘The mule is more beautiful and noble.’ He said, ‘The donkey is friendlier for me.’ I then dismounted and he rode the donkey and I rode the mule. We traveled until it was time for prayer. He said, ‘O Sadir, dismount and we should pray.’ Then he said, ‘This ground is soft, prayer is not permissible here.’ We moved to a red ground and he looked to a boy who shepherded goats. He said, ‘O Sadir, were I to have as many Shi’a (followers) as the number of these goats, then it would not have been permissible for me to sit (without proclaiming my leadership).’ We dismounted and prayed. When we finished the prayer I turned to the goats and counted them. There were seventeen heads of goats in the flock.’” (al-Kafi)
http://www.scribd.com/doc/33892794/Usool-al-Kafi-Vol-2-English