Actually, Johnson and Velazquez have shown some good stretches over their careers.
Look, I have little faith in Johnson or Velazquez, in fact, I have close to zero faith in either of them, but I see Chacin in about the same way- maybe a little better. I'd bring all 3 back next spring along with others and see who may shine. Chances are none of these three will, but the more we bring back, the better chance we have that one or two turn out okay.
Johnson looked very promising in 2018. That was not that long ago. Again, I have little hope in Brian, but that 2018 sample size is way bigger than Chacin's brief flash of goodness.
Johnson had 13 starts, last year. We went 9-4 in his starts and he had a 4.15 ERA. Overall, he pitched just under 100 IP with a 4.17 ERA. (MLB: 4.84 ERA in 166 IP/ AAA: 3.21 ERA in 278 IP/AA 2.83 ERA in 124 IP)
Velazquez had 8 starts in 2018. He also had 1 4.15 ERA as a SP'er, and we went 5-3 in his starts. Hector has already proven he can go 85 IP with a 3.18 ERA (2018). (MLB: 3.85 in 161 IP/ AAA- 2.34 ERA in 119 IP/ Mexican League 3.76 ERA in 687 IP)
I don't expect him to do that in 2020, but I think we should bring him back.
Chacin has a long history in MLB. He's been good and very good, at times. He has a 4.00 ERA from 2016-2018 with a 1.28 WHIP. Sure, there's hope. Sure, I'dlike to see him in the mix next spring. He's had longer stretches of success than Johnson and Velazquez, but he also has looked as bad as them both. He was at 5.79 with MIL, this year with a 1.52 WHIP in 89 IP. He's been over 4.80 in 3 of his last 6 seasons. He's been under 3.90 the other 3.