As far as Painter, patience.
His biggest problem is a hittable 4 seamer despite 96-98, lack of spin and deception proving my point that there are diminishing returns to velo above 95 MPH or so. But I'd think that's something they can work on over time, the important thing is he has his velocity back after TJ.
Otherwise he has great secondary stuff, needs to improve command and consistency, but we're not talking a 2 pitch pitcher you hope can find a 3rd pitch, more of a 5 pitch pitcher who just needs experience and coaching to refine his stuff.
Still see Painter as a #1 in 2-3 years.
As far as Luzardo, did the same thing last year, had a horrible stretch of a few games where he got blown up, then Cy Young level pitching the rest of the season. So I'm fine with him.
If Nola can pitch backwards and limit his 4 seamer to a "show me" pitch, he can still be a solid, though overpaid, #4.