Can a tour group have both a full escort and a tour leader?

Of course, these are two different concepts.

The first one is to accompany the tour guide all the time, but to be a tour guide in the same place as the tourists.

The team leader is the person who leads the team, and can be a tourist (for example, a person from a certain unit travels). The team leader is usually the unit leader). However, if it is an outbound group, it must be approved by the Tourism Bureau (that is, holding a tour guide card). At this time, the tour leader is a travel agency.

They are different responsibilities and concepts.