To break through to the Golden Core Realm, generally one Dao Seed is usually enough.
Seldom like Mei Xianfu, who used five Dao Seeds.
Mei Xianfu having five Dao Seeds, one was given by the old Sect Master of the Shuiyun Sect. The other three were given by Tian Lin, obtained from the Shuiyun Sect, alongside the one from the old Sect Master.
To collect all Five Elements Dao Seeds, Elder Mei even used her connections to exchange two Dao Seeds for one Criminal Law Dao Seed.
The Criminal Law is governed by Houtu, representing the autumn's severity, belonging to metal in the Five Elements.
And the Dao of Criminal Law belongs to a petty path, in reality, it can't represent the 'metal' path in the Five Elements Great Dao.
Yet, a Dao Seed is just a 'seed'; the Great Dao is acquired by first getting the Dao Seed, then slowly cultivating oneself.
Dao Seeds cannot manifest a Great Dao, so Tian Lin's 170 Dao Seeds are all seeds from the myriad petty paths.