Only the doctor with the best surgey success chance will perform surgeries.
If he is the one on the table, the next best one will perform the operation.
Of course, only doctors with some movement and manipulation can perform surgeries!. If your doctor with the best surgery success chance is incapable of walking (not downed!! )or manipulation, the next best one will be performing the surgery
Check out the [url=https://ludeon.com/forums/index.php?topic=28678.msg289089#msg289089]official forum post[/url] for other mods and infos
For Biotech paramedic mechs:
Its not possible to check if a Mech control group mode is ment for "working" due to mod capabilities from rimworld source itself - therefore mechs will be considered as "working" even if set on dormant recharging.
This MIGHT lead to operations not being done cause the dormant paramedic mech is considered as the best surgeron
