The second is a comma-splice error, but I don't really know what to do about the first one. What would be the joining word? 'Or'? Then maybe you're right.
The first is fine. "possibly a few" is a contrasting phrase because it clarifies the meaning of "more than one present" without restricting it further; hence, a comma is required.
This is the same as sentences like:
The roses were a deep red, almost brown. He was decent looking, perhaps even handsome. His share of the loot is adequate, though by no means substantial.