2016 was Jennings's freakishly good season. He was actually dropped in 2015 and went to South Africa to play club cricket; I think he got a bit of a kick up the arse and some strong words from his father. The result was 2016.
He got into England (century against India) and carried his form into the early part of 2017 but then his form completely collapsed at some point during the one-day campaign. I've never personally seen someone's form end so abruptly.
Yeah, but once again Jennings is a player with a highly questionable career average in FC cricket. It's why I'm quite sceptical about picking Vince again or looking at Malan again. England don't have many great options, that's why I mentioned Hildreth who has had a raw deal considering his career record. I think FC consistency season upon season is the best thing to look at for test selection and Burns is miles ahead of the pack on that basis in my view. Your criteria for selection is possibly different to mine though.