I don't get the Jenson Button love like he's some all time great driver and people clamoring for him to come back to drive for Mercedes. The guy mailed it in for like the last 6 races this year and hasn't really done much lately. Granted his car sucked the past 2 years but so did Alonso's and he was still competitive with the midfield.
If it is Pascal, then he really lucked out. I remember a few weeks ago, Pascal was pretty pissed when FI took Ocon over him and his choices were either Sauber or Manor. Now there's a decent chance he gets the big dog seat after having done the tire testing for Mercedes.