Drivers need to start somewhere. Riccardo start at HRT or Marussia if I'm not mistaken, Leclerc at Sauber, Russell at Williams, etc. I think Haas is a good place for Mick to start because he won't have pressure and will just need to concentrate on his team mate. As much as Gio is truly a nice guy, he is not on par with 40-old Raikkonen and he crashes a lot.