We didn't count on Brasier at the start of the year, but he did well. It's hard to plan on "getting lucky" again, but you are right- sign more guys like Brasier and you have a better chance one turns into Brasier.
As for the 125 IP'd (less than 1/5th of our total RP IP, but most were very important ones) needing to be replaced, we could possibly, barring injuries to any pen arm, get more from these guys.
Relief IP in 2018
62 Barnes same
60 Hembree same
55 Velazquez same, maybe more if no starts
41 Workman maybe +10-20
39 Johnson same, maybe more if no starts
34 Brasier should be +25-30
30 Wright who knows?
24 Thornburg maybe +25-30
22 Poyner maybe +25-40
15 Walden who knows?
7 Scott who knows?
Gone
65.2 Kimbrel
62.1 Kelly
22.2 Pom
15.0 Cuevas
14.1 Smith
7.2 Haley
2.1 Beeks