The only QB left is now 4th string. Zach Wilson and Baylor Romney were brought in. The outlook looks 10X brighter.
The RB situation now has 2 strong prospects to build around in McChesney and Finau. The addition of Ty'son was obviously a position changer. The personnel in 2017 was average and below in aggregate with limited upside.
The WR group improved a lot since 2017. That may or may not have happened under either staff.
The OL coaching is likely better in 2019 with Grimes, but I can't say for sure.
The TE group is a wash.