Out of interest: CircleCI also has flaky test detection, rerun failed tests etc. Or did you mean that the CI that you were moving towards could benefit from Captains features?
I didn't make myself clear I think. You mention that you love Captain, and wish you had access to it when migrating away from CircleCI. I'm interested in understanding the specific reason(s) for your love for Captain's features, that seem to also be available in CircleCI?