uhhh. 27th most accurate kicker on XPs? He was 24th in 2017, 25th in 2016, and 17th in 2015.
FG% is a little better (13th last year, 1st in 2017, 25th in 2016, 20th in 2015).
The stats aren't that great. Gano is pretty average besides that one great year in 2017 (minus the missed kick in New Orleans). NYG game winner last season was pretty badass though.
He's definitely not trash, he's just making a lot of money. Slye would almost certainly be a downgrade, but he's not making very much at all (less than half a million IIRC). The question is if that downgrade is worth 4-5 million dollars in cap.
Gano is the safe option and I'd be shocked if we dumped him...
Also this... We know what Gano is, but Slye is completely unproven. Going to take a hell of a lot more pre-season FG's before I'd be cool giving him the starting job, esp. if he was bad in college.