Well then the “saints” would be all believers, not an apostolic college.
The saints are all who are in heaven, but not all believers because we are not saved by our beliofs only. It is true that there are far more saints in heaven that just the Holy Apostles. Among the saints are all the canonized saints of authentic Churches, as well as countless men and women who are saved but the Church did not canonize them.
The Church only canonizes those who develop substantial veneration among the faithful and manifest themselves through provable miracles.