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Hadith al-Kisaa' is one the most authentic hadiths in both Sunni and Shia books. It is a Mutawatir متواتر Hadith.
 
The meaning of hadith al-Kisaa' is agreed upon by all the scholars of the science of hadith in both Sunni and Shia schools of thought.
 
This stage of confirmed authenticity is called tawatur ma'nawi تواتر معنوي which means it has been narrated by most authentic narrators in the same meanings of it.
 
Umm Salama, the wife of Prophet Muhammad (SAWA), Aisha, Abu Sa'id al-Khudri and many other well known narrators have narrated the incident of the kisa being put by the Prophet (SAWA) on Ali (as), Fatima (as), Hassan (as) and Hussain (as) with him and his dua to Allah (swt) saying "Allahuma haa'ula'i Ahlubayti" which means "Oh Allah, these are my Ahlul Bayt (progeny)".
 
Hadith al-Kisaa', which is recited in many gatherings of the momineen, is also narrated fromJabir ibn Abdallah Al-Ansari from Lady Fatima (AS) by authentic Shia ulama like Sheikh Abdullah al-Bahrani in his well known book al-'Awalim.
 
The narration is continuous by authentic narrators until al-Sheikh al-Kulayni who narrated it by continuous change of authentic narrators till Jabir ibn Abdullah al-Ansari. The hadith has been narrated by:
 
·        Shahid al-Shushtari who is well known in India as al-Shahid Salis (Thaalith) in his book Ihqaq al-Haq (vol 2, page 554)
·        Al-Turaihi in his book al-Muntakhab
·        Sheikh al-Daylami in his book al-Ghurar wal-Durar
·        Zain al-Dimishqi al-Hanafi who is a Sunni scholar
 
A person who tells you that hadith al-Kisaa' does not have a good source of narrators has misunderstood the situation of this Hadith or maybe has less knowledge about Hadith al-Kisaa'.
 
There are people who create doubt about anything even about Allah (swt) and the Qur'an or the Prophet (SAWA) but we don't care for anyone who creates doubt when they do not have any authentic evidence.
 
Great ulama have narrated hadith al-Kisaa' and its meaning has been narrated by main Shia and Sunni books of hadith.
 
Hadith al-Kisaa' in its meaning is the incident of the kisa when the Prophet (pbuh) kept the kisa on Ali (as), Fatima (as), Hassan (as) and Hussain (as), and Jibrail also coming and taking part with them is also narrated by:
 
·        Sheikh al-Tusi in his book al-Amani
·        Tafsir al-'Ayyashi
·        Tafsir Furat al-Kufi
·        Tafsir al-Qummi by Ali ibn Ibrahim
·        The book of Sulaym ibn Qays
·        Kitab al-Khisal by Sheikh al-Saduq
 
We need to be careful of those who claim anything against our faith, claiming they have some doubts. Let their doubts remain with them, for them and on them, but they have no right to create doubt among the believers regarding a hadith which is one of the most authentic hadiths.
 
In Sunni books the hadith al-Kisaa is narrated in its meaning in:
 
·        Sahih Muslim (vol 4, page 1501, hadith no. 2424)
·        Musnad Ahmad ibn Hanbal (vol 6, page 292)
·        Sunan al-Tirmidhi (hadith no. 3796)
·        Al-Mustadrak alaa al-Sahihain by al-Hakim al-Nishapuri (vol 3, page 133)
·        Musannaf Ibn Abi Shaybah (vol 6, page 373, hadith nos. 32093, 32094)
·        Asbab al-Nuzul by al-Wahidi (page 295)
·        Al-Suyuti in al-Durr Al-Manthur (vol 5, page 198)
·        Ibn Taymiyyah, the well known enemy of the Ahlul Bayt (as), admitted the authenticity of hadith al-Kisaa' in his book Minhaj al-Sunnah (vol 3 page 4)
 
You mentioned in your question that the person who told you that hadith al-Kisaa' has no strong source seems to be a scholar. I am sorry to say that he might seem to be a scholar among people who are not scholars but a person who speaks this about hadith al-Kisaa' according to the authentic scholars needs to go and study the authentic sources of Hadith al-Kisaa. He needs to study and research more to know that hadith al-Kisaa' is one of the most authentic hadiths.
 Wassalam.