Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "The maternal uncle is an heir."
There is disagreement over this from Sharik, as you see, and Layth bin Abi Sulaym is not used as evidence, and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12214