He's been stopping shots better than Reina but his positioning is shocking & he doesn't tell the defence where to be ever.
That may sound irrelevant but if you watch our back line remain static as the ball moves (as opposed to pushing up to create offside or moving to close down a threat) in think it increases risk of conceding.
His distribution is also poor, but Reina's has been this season.
In current form (pepe before injury obv) neither are good enough imo & both have massive flaws. I'd probably stick with Jones for a few more games but if he didn't improve that distribution & positioning he'd be dropped again.
Inbox.