There is one obvious kind: Those who either claim or present or somewhat indicating themselves to have helped stephen Tong organize this or that events or to know Stephen Tong at some personal level:
This is the type one should stay away from. Beware of them. For they are very likely to be not true servants of the Lord. It shows in their own ministries: They don't grow, they are stuck in their own profession without much witnessing, some mutate from one theological form to another, some become anti-gospel-centered.