What are you basing this on? He made two errors this spring. Not great, but 57 players made 3 or more errors and 150 players made 2. Andrew Benintendi and Ahmed Rosario made six errors each.
And yes, Jones has made one error since the MiL season started. Anthony Servideo has made 2. So has Toby Welk. It’s early, you typically see more errors this time of year.
By the way, I’m not saying Jones is good defensively. I’m just saying you don’t have much to go on yet to conclude he’s been terrible.