Is there any doubt among New Testament scholars that "and then to the Twelve" in 1 Corinthians 15:5 refers to an appearance to a group?

Just to be clear, this isn't a question about whether there were ten, eleven, or twelve in the group, but rather how certain we are, perhaps based on the syntax of the original Greek, that "and then to the Twelve" in 1 Corinthians 15:5 is a reference to an appearance of Christ to a *group* of apostles, as opposed to a series of *individual* appearances to the rest of the apostles besides Peter. Perhaps this is an odd question, as I've never seen it asked before. Is there any dispute about this among New Testament scholars?