Looks like I am one of the few who puts Jones ahead of Smalling. He's a better passer than Smalling, esp. when looking for a long pass. He can also play in the midfield, which is a boon given our current midfield situation. Plus (and this is probably a small point), Smalling gets very handsy while defending - which, given VAR, is dangerous.
The only thing I think we lose with Smalling, is aerial ability. I feel a lot more assured when Smalling goes up for a header than when Jones does.
I'm guessing that a 20 start season would be slightly less taxing on Jones injury wise, since he will be starting behind Maguire and Lindelof. If Ole is around next season, I think we will get another solid defender, and get rid of Rojo and Bailly, so that Jones can be 4th choice.