I think it is a coaching issue in two aspects.
1. The RPO leaves the O-line in the lurch. They can not tell if it is a run or a pass, so they really can not block either technique. I think to improve this they need to go to the line with a primary call and an option to go with an alternate. If the primary call is a run play the only option is a pass play. This is obviously a Nagy thing, and to be honest I think it would give Trubisky less to think about, go to the line and make two reads, run or pass.
2. Harry Heistand did the same shit the last time he was here, he took a good line and they regressed dramatically. They have let him go and hopefully Castillo can get Leno and the rest of the o-line back to a respectable unit.
As far as Leno goes, this was his worst year, no doubt, so to hedge your bets, we need to draft competition at Tackle, if they do not take at least 1 Tackle in the second round I will consider it a failed draft.
I hope to see Leno return to form, because he has throughout his career played well, excluding last year.