[Calvin Locke]

why only 5?

Probably any more would result in what happened to audience members in "The Hitchhiker's Guide to the Galaxy":

"During a recitation by their Poet Master ... four of his audience died of internal haemorrhaging, and [another] survived by gnawing one of his own legs off.

[skinkinthegrass]

Thank you, that’s (the :) most logical answer.
..no sane individual would listen to that pychobabble.