Maybe. Maybe not.
Sisk in 2022 in AAA at age 25:
34.2 IP, 11.16 K/9, 4.67 BB/9, 0.00 HR/9, 2.08 ERA, 2.93 FIP. 3.74 xFIP
Funderburk in 2023 in AAA at age 26:
52.0 IP, 12.98 K/9, 3.63 BB/9, 0.17 HR/9, 2.60 ERA, 2.35 FIP, 3.15 xFIP
Their numbers aren't THAT different. Obviously Sisk is struggling with his new club this year, but here's hoping Funderburk is just a late bloomer and can be asset in the pen for year's to come. Having 2 lefties would pay some nice dividends.