I think Franchy's defense is fine.
The problem is that Renfroe can't hit a lick against RHP. He has an OPS of 310 or so this year. That's just unacceptable. Career wise, he's a 900 OPS guy against LHP.
It looks like they are giving each guy a chance to win the job as these three all have relatively the same amount of PA's. It just seems to me that Arroyo has been more successful that Renfroe or Franchy.
If we scrapped the idea of a platoon in OF, I'd have Franchy be the starter in LF, Kiké in CF and Arroyo at 2B. Renfroe would be a RHB off the bench.