Ask HN: Why Doesn't Y Combinator have an Engineer in Residence?

TechStars has added a role of "Hackstar" which is essentially an Engineer in Residence analogous to the "Design in Residence" role Garry Tan has at Y-Combinator.

Has Y-Combinator considered a role like this?

What is the thinking behind this role for incubators?

Relavant links: http://bostinnovation.com/2011/03/18/calling-all-hackers-%E2%80%93-techstars-wants-you/?isalt=0 http://www.techstars.org/hackstars/