Going by runs created
If Uggla played the way he's "suppose" to (career line of .258/.338/.481), he'd add 8 more runs. If Cody did (.255/.315/.476), that's 9 more.
If ricky pitched the way he was suppose to (FIP 4.34, career ERA 4.49), we'd have 16 less runs against.
That also isn't then including the fact that Cody and Uggla would have more PA and Ricky would have more IP.
That would then put us at 176-156 RS-RA instead of 159-172. We currently have a .461 Pythagorean win % (16-19 current record, 74 win season). If they were right, we'd have a .560 (19-16 current record, 90 win season).
When it comes to our offense, we knew what we were getting out of Boniacio and we knew there was a decent sized chance Maybin would fail. We knew Anibal and Miller were questionmarks. Optimistically, we could look at us as being a mid-90's team. Looking at those 4 to fail, we'd probably be a mid-80's team.
Having all 4 of those fail, plus having 3 good regulars have the bottom taken out beneath them is what's put us on this slide.
If Uggla goes back to .800+, cody goes back to 800+, Ricky goes back to sub-4 the rest of the way, we should still be fine. Some breaks go our way and we'd be better than fine. And based off how they're "doing" (cody and uggs hit LDs and such, Ricky still King and not BBing guys, ect), I think they can go back to those things.