I would appreciate some advice with regards to the above question.
The condensed version is that I am working with a co-researcher in undertaking a thematic analysis on focus groups and 1 - 1 interviews. Because of the nature of some of the focus groups, my co-researcher wishes to bring someone in at the coding discussion process (so we are both coding the transcripts independently, and then coming together to discuss this - it is at this stage and not prior that they want to bring the person in). They want to bring them in, as they feel they have experience with the sample group, and so would be able to say whether the themes reflect accurately with that persons perception of that particular group of individuals. This would occur only for one type of sample group for the process, not the rest, e.g. focus groups conducted on fish, but the two that are held on seahorses, we bring in a seahorse to see if the themes reflect the seahorse cohort. (Sorry, looking at a fish tank at the moment!).
As they would not have been a part of the coding process, would this be "ok" to do?