Alonso. With his previous history at the team, I don't expect them to cut him a lot of slack.
I am also not convinced of his ability to develop a car. In his five years at Maranello, the team finished: 3rd, 3rd, 2nd, 3rd, and 4th. Their point totals were: 396,375,400,354, and 216.
From that, it appears that they were on a constant downward trend while FA was their lead driver. Not a ringing endorsement of his abilities to improve a team, as far as I can see.