On: We only hire the trendiest

[brown]

Not the OP, but I would have used the word "caginess" or "excess self preservation".

You don't want to hire a shark who's going to work against you.

[grandalf → brown]

Exactly. I realize now that the term "poker face" came across as too literal, and what I was really trying to describe was exactly the sense of caginess or unwillingness to put one's self out there.