The problem with signing Shoemaker and Happ (or nearly any free agent last year) is that 2020 was a wasted year. Look at their stats and its hard to tell if they were good or bad. A major reason for that is the sample size was too small. I imagine the same could be said with all pitchers who were not "top 5" caliber. In the end it made it much more of a toss at the dart board than it should have been. For example in 2017-2019 Happ was great. so were his average numbers in 2020 because of him aging or due to small sample size? who knows.
i would tend to give falvy and levine a pass for last year. however, Bailey and Perez were headscratchers.